UFC

The whole world is wondering when/if Conor McGregor and Floyd Mayweather will step in a boxing ring, but Jay Glazer is about to tell us how long Floyd would last with Conor in a UFC Octagon.

We got Jay out at Catch in L.A. and instead of talking about a fight that MIGHT never happen, we talked to him about another fight that will NEVER happen ... Floyd vs. Conor in MMA.

Conor McGregor says he's fascinated with Khloe Kardashian's "big fat ass" ... and says he really wants to see it in person.

The UFC superstar sat down with GQ during a recent trip to L.A. and was asked what he was going to be doing while in town.

"Maybe I’ll search for Khloé's [Kardashian] big fat ass," Conor said.

"She’s been floating around Malibu. I don’t give a f*ck about them [the Kardashians]. I just like to see them in the flesh ... just see what the big fat asses on them look like."

When asked if he admired the Kardashian sisters, Conor said, "Admire? Never. What’s the saying? Never put the p*ssy on a pedestal, my friend. I just want to see it. I want to see them."

Don't worry, Conor also took some shots at Floyd Mayweather -- saying he will destroy the boxing legend if they ever actually fight.

"Honestly, my fist is bigger than his head. I sleep people. I put people unconscious. I’m stating facts. If I hit a man, his head is gonna go into the bleachers. You understand that?"

"If I crack that little head of his, it’s gonna go clean off his shoulder and up into the bleachers."

Floyd Mayweather says he's not the reason for the hold-up on a superfight with Conor McGregor -- and is pointing the finger at the UFC.

"Listen, Conor McGregor, if you really want to get this fight done ... take care of your business with the UFC and then have your people get in touch with my people," Mayweather wrote.

For the record, Dana White has already offered terms -- $25 mil per fight plus a Pay-Per-View split. Floyd laughed it off and never countered.

As for Conor, he's in Vegas -- which he now calls "My City" -- despite the fact Floyd lives there.

IT'S ALL OVER!!

Brock Lesnar has informed the UFC he's officially retiring from MMA.

The 39-year-old superstar informed the UFC about his decision, a rep for the organization tells MMAFighting.com.

Lesnar was a beast in his prime and beat up on some of the greatest fighters in UFC history -- including a win over Randy Couture to win the UFC Heavyweight title back in 2008.

Lesnar had been suspended for 1 year by USADA after failing two UFC 200 drug tests and would have been eligible to fight again in July. Instead, he's hangin' 'em up.

If Lesnar does decide to fight again, he would still have to serve the remainder of his suspension before he would be cleared to get back in the Octagon.

Back in August, Lesnar told TMZ Sports he was considering another fight ... but clearly, things have changed.

Dana White tells TMZ Sports plain and simple ... when it comes to the Floyd Mayweather vs. Conor McGregor fight, "There is no deal."

After suffering her 3rd loss in a row, Holly Holm needs to take a break from UFC and try to get on "Dancing with the Stars" ... so says UFC champ Tyron Woodley.

35-year-old Holm hasn't won a single fight since KO'ing Ronda Rousey back in 2015 -- and after her latest loss at UFC 208 over the weekend, some people are saying her fighting career is over.

Woodley isn't ready to stick a fork in Holm -- but says she needs to focus on building her brand OUTSIDE of the Octagon while she's still famous ... and thinks 'Dancing' could be the perfect fit.

The only flaw in Woodley's logic ... is it too little, too late?

Now that he's been acquitted in his domestic violence case, Jason "Mayhem" Miller is focusing on his career ... telling TMZ Sports he WILL fight again -- and could possibly dabble in porn.

The 36-year-old was outside Mercado Muay Thai where he praised his fans for their support during the trial ... a trial which revealed some freaky-deeky details about his sex life in open court.

And now that it's all out in the open ... we asked if he would take his career in that direction. Don't count it out.

As for his fighting future, the former UFC star says he's in talks to brawl again in the very near future.

Anderson Silva just got one helluva compliment from Dana White -- who says the MMA legend is the "Tom Brady of the UFC."

Dana White is currently in Houston.

Floyd Mayweather is also currently in Houston.

Coincidence?

Yes ... says Dana White who says there's been ZERO progress made in the Floyd Mayweather vs. Conor McGregor negotiations.

"I think the odds of this happening are like the odds of me being the backup QB for Brady on Sunday."

UFC star Yair Rodriguez -- who was born in Mexico -- says it's "cool" that Donald Trump wants to take care of the "bad hombres" south of border ... and thinks POTUS could be the guy to help fix his country.

The topic arose after Trump reportedly placed a call to Mexican president Enrique Pena Nieto and warned that he might send U.S. troops if the Mexican military couldn't control the "bad hombres down there."

"I mean I think that's cool, you know?" Rodriguez told TMZ Sports ... "We have some troubles in Mexico right now."

Yair said he's not sure sending U.S. troops is the answer -- but it seemed like he was happy Trump wants to get involved in fixing the issues in his homeland.

Somewhere in heaven (or Jamaica) Tupac is smiling ... 'cause Conor McGregor is keeping his name alive by using a classic Pac line to swag up his $750 shoes.

The Notorious one posted a video to his snap of some adoring fans trying to get in his ride while he keeps the focus on his feet ... which happen to be adorned in $750 Jimmy Choo "John" slippers.

How do we know they're JC's? Because Conor shouts it out saying, "The shoes are Jimmy Choo, and if you're not down with Jimmy Choo, F*** YOU TOO."

Of course, that's a take on the classic line from "Hit 'Em Up" where Pac gives the same option to those who want to be down with Bad Boy.

BTW ... the fans love it, but who probably won't is the guy who's gonna have to detail the leather in Conor's Rolls, which he's DESTROYING with his shoes. Gotta love him.

Dana White tells TMZ Sports it's pretty obvious what happened to Ronda Rousey -- "One day you show up and you don't have it anymore."

The UFC honcho appeared on the "TMZ Sports" TV show (airs Tuesday night on FS1) and said Ronda's career has gone the way of MOST great professional athletes.

"It's no different than any other sport. When you're a professional athlete and you're competing at a certain level, the day comes when you don't anymore. It happened to Ronda."

White says, even though he thinks Ronda is turning the page on her fighting career, she'll always be connected with the UFC.

Floyd Mayweather or Manny Pacquiao?

Tito Ortiz says it doesn't matter ... 'cause Conor McGregor would get his ass kicked by either guy in a boxing match.

The Huntington Beach Bad Boy was at ArcLight Hollywood for the "John Wick: Chapter 2" premiere when he told us straight-up ... MMA fighters don't stand a chance against boxers in a BOXING MATCH!

It's likely over for Ronda Rousey ... so says UFC honcho Dana White who says when it comes to fighting, "I think she's probably done."

White appeared on the "UFC Unfiltered" podcast and was asked straight-up about the chances of Ronda getting back in the Octagon after she got destroyed by Amanda Nunes at UFC 207.

"In the conversation I had with her, if I had to say right here right now -- again I don't like saying right here right now because it's up to her -- but I wouldn't say she fights again," White said.

"I think she's probably done ... She's going to ride off into the sunset and start living her life outside of fighting."

Ronda's been busy since the fight ... protesting the Dakota Access Pipeline and working on getting her concealed weapons license in Nevada.

If she is done fighting forever ... salute to Ronda. She's a legend.

If Conor McGregor wants Pacquiao ... Manny's promoter says it's as good as done!!!

Here's the deal ... Conor raised the idea of fighting PacMan during his Pay-Per-View Q&A session over the weekend while being pressed on the possibility of fighting Floyd Mayweather.

"Maybe f*ck Floyd," McGregor said ... "Maybe f*ck the A-side. Maybe I’ll just fight Pacquiao instead. Why not do that? Why not fight Manny and f*ck Floyd?”

So, we spoke with Manny's longtime promoter, Bob Arum, who said he'll do WHATEVER IT TAKES to make that fight happen.

Mostly because it's easy money ... with Arum saying Manny would KO Conor without even breaking a sweat.

Ronda Rousey is not a complete fighter -- and will never be able to keep up with the new crop of women competing in the UFC ... so says Daniel Cormier.

The lightweight champ says he really likes Ronda, but had to keep it real when talking about her fight career -- explaining why her days of pure domination are over.

Cormier also has a message for his UFC 210 opponent, Rumble Johnson -- saying he plans to STAND UP BOX the brawler when they face off in the Octagon on April 8.

And after that ... Cormier says he needs to fulfill his destiny and finally get that rematch with Jon Jones.