LAS VEGAS — Conor McGregor's verbal warfare with WWE is hardly over. And on Friday he took particular aim at the most popular pro wrestler in the company.

"What's the main guy? John Cena," the UFC featherweight champion said at a gym day to promote UFC 202. "He's 40. He's 40 years of age. He's walking around in a luminous orange t-shirt and a headband talking about nobody can see him. We can see him right there. He's a big fat, 40-year-old failed Mr. Olympia mother f*cker."

McGregor first took aim at WWE stars during a media conference call last week, calling them "messed up p*ssies." Of course, pro wrestlers and wrestling fans alike took to social media to slam McGregor right back. Many challenged him to a fight. Pro wrestling legend Ric Flair was particularly upset, saying McGregor stole his longtime brash arrogant rich guy gimmick.

"I don't know what to say to Ric Flair," McGregor said. "This ain't no gimmick. This is the real sh*t. I've gotta get in and fight a man for real. With no script, with no nothing. He was talking about bringing some other wrestler guys out to challenge me. Come bring it, then. This is the real shit over here. You know want to come over, we can fight no problem. A few of them are talking about the street and all. If they want to do that, come at me and see what happens."

McGregor, 28, has his big rematch with Nate Diaz coming up in the main event of UFC 202 on Aug. 20 here in Las Vegas at T-Mobile Arena. He has rented out a space and had a makeshift gym built for him. McGregor is dead serious about getting back that loss to Diaz from back at UFC 196 in March.

But McGregor also enjoys taking shots when he can. And this time it was to the current WWE stars. Not the old ones. The brash Irishman was specific about that.

"Like I said, no disrespect to the dons of the game, the McMahons," McGregor said. "[WWE CEO Vince McMahon] is a f*cking legend. They wrote Vinny off a few years ago when he dropped from the billions and then he rose back up and now he's back in the billionaire club. What he's been able to do with that bunch of dweebs he has over there at the moment has been phenomenal and I respect him for that. And then of course the OGs of the game, The Rock, Stone Cold, they're cool mother f*ckers. Even Ric Flair is a cool mother f*cker."

McGregor has admitted to being a pro wrestling fan in the past, in some respect. But he does not seem to be too into the contemporary performers like Cena, who is extremely popular with the younger demographic.

"I'm just speaking the truth," McGregor said. "That new age of those guys are absolute dweebs. They just seem messed up in the head. I don't know what it is. When I listen to them talk, when I listen to them carry themselves, they just don''t seem right in the head. That might have been a bit rudeness for me to say, but again: It ain't trash talk, it's truth talk."

The original question McGregor was asked last week was about if he would ever perform for WWE. His answer was no, because of the current climate. It doesn't mean McGregor doesn't think he could conquer that medium as well.

"I've got them all wrapped up on my little finger," McGregor said. "The boxing game, the MMA game. Now I've got those wrestling dweebs in here as well. I've got the whole sh*t locked up."