Conor McGregor once described WWE star John Cena as a "big fat 40-year-old failed Mr. Olympian motherf**ker."
McGregor aimed a brutal dig at Cena in the build-up to his blockbuster rematch with Nate Diaz back in August 2016.
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He took several shots at the WWE, in particular - Cena. The Irishman pulled no punches during a scathing rant.
"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," he said.
"You can see him right there - he's a big fat 40-year-old failed Mr. Olympian motherf**ker. Do you know what I mean? They're dweebs those guys."
However, McGregor was full of praise for the likes of Ric Flair and The McMahons.
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"Ric Flair's a legend but as far as gimmicks, this is the real thing over here," he added.
"I think these WWE guys, they're not right in the head some of them. I mean the new guys are dweebs, let's be honest, absolute dweebs but the old school guys are legends. Ric Flair is a legend. The McMahons of course - Dons. But I just say it as it is - they're dweebs.
"I don't know what to say to Ric Flair. This ain't no gimmick, this is the real (expletive). I've got to get in there and fight a man for real. With no script, with no nothing."
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Cena, 43, is currently signed to the WWE on a part-time deal while McGregor's eyeing a summer return following his triumphant UFC comeback in January.
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