UFC's Conor McGregor is back to trash-talking WWE wrestlers, namely John Cena

This public feud between the UFC superstar and WWE is getting intense

Conor McGregor is not backing off his comments about the WWE. Last week, he lit up the company with this tweet.

I didn't mean no disrespect to the @wwe fans. What I meant to say was that I'd slap the head off your entire roster. And twice on Sunday's.

— Conor McGregor (@TheNotoriousMMA) August 7, 2016

Well, WWE wrestlers didn't exactly like that and ripped McGregor mercilessly on Twitter. Now, McGregor is firing off at one of the company's biggest stars. At an open workout on Friday, McGregor took aim at John Cena.

"What's the main guy? John Cena? He's 40 years of age, walking around in a luminous orange t-shirt and headband talking about no one can see him," McGregor said per FoxSports.com. "You can see him right there -- he's a big fat 40 year old failed Mr. Olympian (expletive). Do you know what I mean? They're dweebs those guys."

I mean, OK. So Cena did compete in Mr. Olympia before taking on the persona in WWE and didn't win, but what a random shot to fire off. Cena hasn't even said anything about the Irishman and his antics. Cena is also 6-foot-1 and somewhere around 250 pounds, 100 pounds more than the weightclass McGregor currently holds a belt in.

But one thing McGregor does better than anyone is aim big. He did just that with with a little extra hot sauce.