UFC

They've said some pretty nasty stuff to each other ... but Daniel Cormier says there's ONE insult that pisses Jon Jones off more than anything else.

DC was out in NYC promoting his big fight with JJ at UFC 200 in July -- when he told us he knows exactly how to get under Jon's skin ... and doesn't plan on stopping anytime soon.

Bo don't know Brock ... apparently.

With Brock Lesnar referring to himself as "the modern day Bo Jackson" -- due to his UFC and WWE success -- we went right to the 2-sport authority and asked Bo himself how he felt about the comparison.

UFC badass Ronda Rousey's secret is out ... she's a big softy at heart.

Check out the book Rousey was carrying Thursday as she left Glendale Fighting Club. It's Jojo Moyes' wildly popular romantic novel "Me Before You," which was made into a major chick flick that came out last week.

Yup ... sometimes fighters need a good cry too.

"You go ... or they go."

That's how UFC fighter Valentina Shevchenko feels about her trainer's decision to pull his gun and fire at gun-toting thieves last month during an armed robbery in Peru.

Shevchenko joined the guys on the "TMZ Sports" TV show and broke her silence about what was going through her mind when 3 armed men stormed the restaurant where she was having dinner.

As we previously reported, her trainer, Pavel Fedotov, pulled his gun and fired at the robbers, killing 1 -- but was shot in the stomach during the exchange.

Shevchenko says Pavel is still hospitalized-- but hopes he'll be able to travel to Chicago to see her fight Holly Holm at UFC on FOX 20 on July 23.

So Nate Diaz has an N-word pass.

The UFC star was rollin' into Bootsy Bellows nightclub last night ... when he used the word (with an "a" not the "er") during a friendly exchange with a photog.

UFC champ Michael Bisping says Luke Rockhold was a real "a-hole" after UFC 199 -- insisting he TRIED to be respectful to Luke ... but Rockhold was too busy being a "sore loser."

FYI, Rockhold blasted Bisping on Instagram Tuesday morning ... calling the guy "classless" for refusing to shake his hand after beating him on Saturday night.

"I felt it was a classless move on his part," Rockhold said ... "I don't believe in kicking a man when he's down."

Bisping joined the guys on the "TMZ Sports" TV show (airs tonight on FS1) -- and said Luke's completely delusional because he actually tried to shake his hand TWICE.

By the way, Bisping also says he's not ready to retire just yet because a true champion defends his belt!!!

If Brock Lesnar wants a second UFC comeback fight, he may already have a taker -- heavyweight champ Stipe Miocic ... who says he's absolutely down to rumble with "The Next Big Thing."

We spoke with Miocic moments ago who told us he's excited to see Lesnar get back in the octagon -- but expressed concern over the fact BL's been out of the fight game for a couple years and could be rusty.

But if Brock crushes Mark Hunt at UFC 200 and wants a shot at the title -- Miocic says bring it on ... though he's pretty damn confident things won't work out well for Lesnar.

By the way, Miocic already fought Hunt in 2015 and kicked his ass.

Dana White confirms to TMZ Sports ... MMA reporter Ariel Helwani will never receive another media credential to another UFC event "as long as I'm here" ... but says he can still buy a ticket.

Brock Lesnar just announced his opponent for UFC 200 -- and also just bragged that he's making a "BOATLOAD OF MONEY."

Lesnar just appeared on ESPN and said he came up with the idea to return to the octagon on his own -- he wasn't courted back to the UFC -- claiming he felt he had unfinished business. He'll be facing 42-year-old Mark Hunt.

Lesnar had stopped fighting years ago after suffering 2 debilitating bouts of diverticulitis ... but says he still feels the burning desire to fight. So, he called up Dana White 3 months ago and asked to be on the UFC 200 card.

Lesnar said his comeback isn't about money ... but couldn't stop talking about how much money he's going to make -- saying his check will have a WHOLE BUNCH of zeroes. He didn't specify an exact amount.

Here's a shocker ... Dana White is FIRED UP about Brock Lesnar's return to the UFC -- telling TMZ Sports the ex-champ has been training like a beast and feels "like a million bucks."

With Muhammad Ali hospitalized in Arizona ... we asked UFC champ Robbie Lawler to tell us what "The Greatest" of all time means to him as a fighter.

Check out the clip ... it's nothing but respect and well-wishes for Ali.

Urijah Faber says he won't be doing any horizontal wrestling with Paige VanZant outside the Octagon ... 'cause the almighty BRO CODE would stop him from ever, ever, dating his super cute UFC teammate.

We got Faber out in L.A. doing a little press for UFC 199 .... and asked about the smokin' hot ... and apparently single ... Miss VanZant.

Basically, we wanted to know if there was any chance he'd make a run for the 'DWTS' runner-up ... and become the first couple of the UFC.

Urijah makes it clear ... it's NOT HAPPENING ... saying the fact Paige dated his (and her) teammate, makes any extracurricular grappling a clear violation of the almighty bro code.

Bonus awesomeness? Faber also talks to us about his signature butt chin ... and tells us who he thinks has the most iconic booty face in the history of Hollywood.

UFC star Michael Bisping says the producers of of Vin Diesel's new "XXX" movie actually lucked out when Conor McGregor dropped out ... cause they got him instead, and he's a real deal thespian.

We got Bisping out in L.A. and asked him about filling in for Conor on the new flick, which McGregor was slated to star in but then dropped out of.

Bisping makes it clear to us ... he's no replacement ... saying a whole new part was written for the movie and he had to audition to get it.

As far as talking about McGregor's acting abilities ... Michael says there's not much to talk about -- saying Conor's never even done it before ... while he has over ten credits on the all-important IMDB.

We looked it up ... he ain't lying.

Luke Rockhold is a perfectionist ... especially when it comes to sculpting male genitalia.

The UFC superstar says he's mad at himself for the makeshift dong he created for a prank he pulled on his friend during training camp. And if you haven't seen it yet ... it's pretty hilarious.

Long story short ... Luke decided to mess with a friend who passed out while suntanning -- and cut out a silhouette of a penis to put on his back ... to create a penis-shaped sunburn. Hilarious.

Problem is ... Luke says he coulda done better.

Nothing but class from Holly Holm's camp after her upcoming opponent was involved in a violent robbery in Peru -- with Holm's reps telling TMZ Sports they're glad Valentina Shevchenko is safe.

Shevchenko -- who's set to fight Holm at UFC on FOX 20 in July -- wasn't harmed in the robbery but her trainer was shot in the stomach while exchanging gunfire with the robbers.

"We are glad [Shevchenko] is safe," Holm's rep tells us ... "We wish her coach well."

Dana White has said he's not sure if the fight will go on as planned -- considering the incident may have traumatized Shevchenko -- but Holm's camp tells us Holly is still training as if it will happen.

"The fight is on as far as we know."

6:23 AM PT -- We just spoke with Valentina Shevchenko who says she will NOT back out of UFC on FOX 20 ... telling us straight up, "I will fight Holly."

When asked about her health, she told us, "I am feeling good. No injuries. Just a few days was a very big stress to me. I’m just starting to feel better now.”

UFC honcho Dana White says he's not sure if Valentina Shevchenko will still fight Holly Holm in July -- after V.S. dodged bullets in a bloody shootout in Peru ... calling the incident "madness."

As we previously reported ... Shevchenko and her trainer were eating at a chicken restaurant when 3 masked gunmen barged in and began robbing the place.

Shevchenko's trainer pulled out a gun and began firing -- killing one of the robbers ... but he suffered a gunshot to the stomach in the process. Shevchenko escaped unharmed. Her trainer is being hospitalized and is expected to survive.

Wednesday night, White told us he's unsure if Shevchenko will fight Holm at UFC on Fox 20 in July -- but seemed to understand if she decides to pull out.

"When things like that happen, it puts you in touch with your mortality," White said.

Meantime, Shevchenko has issued a statement of her own -- calling her trainer a hero ... whose quick actions saved her life and the lives of the other patrons.