Justin Gaethje Says Conor McGregor Wants My 'Sloppy Seconds'

"I feel like we are in grade school and Conor McGregor is following me around trying to pick up my sloppy seconds."

That's Justin Gaethje blasting The Notorious, telling TMZ Sports Conor McGregor is attempting to fight all the dudes he's already beaten, and the UFC star thinks it's pretty comical.

"I hate to say it because it's disrespectful to the opponents that I beat," Justin says.

"I fought Cowboy [Cerrone]. Then he wants to fight Cowboy. I just beat up Chandler. Now he wants to fight Chandler. He'll never say my name. And, Ferguson is on the list now too."

Of course, Gaethje -- the #2 ranked lightweight -- beat Chandler via unanimous decision at UFC 268 ... in one of the greatest fights of all time.

And, just last year, Justin beat Tony Ferguson by unanimous decision ... which earned him a title shot against Khabib.

Over the last few weeks, Conor expressed interest in fighting both men ... Chandler and Ferguson.

Someone the Irish superstar hasn't called out (lately, at least) ... is Justin.

So, we asked Gaethje -- who has previously made it clear he wanted to mess up McGregor -- if he was still interested in the fight.

"Do I want to make [Conor's] face look like Tony Ferguson and Michael Chandler's? Absolutely. Will he ever allow that? No! He has way too many smart people around this dude and he's not a dumbass."

"He might knock me out. Olivera might knock me out, Poirier might knock me out but they have to pray to God that they land that shot."

We also talked to Justin about his beef with Colby Covington (Gaethje trains with CC's rival, Kamaru Usman) ... and JG makes it known, he ain't looking for a fight in the Octagon with "Chaos."