The "victim" of arguably mixed martial artist-turned-boxer Conor McGregor's most famous quip has finally had his hilarious revenge - by playing the mum card.

Almost a year since Jeremy Stephens was on the receiving end of an epic shutdown by McGregor during a UFC 205 press conference, the featherweight has hit back.

During the event in September last year, Stephens interrupted a fan's question to McGregor, by saying: "when I knock people out, they don't move".

McGregor calmly responded by turning towards him and asking: "Who the f*** is that guy?", to a rapturous applause from the crowd.

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The video has since been viewed almost two million times on Youtube and has seen Stephens nicknamed on social media as the "Who Da Fook" guy.

The American, who earlier this month defeated Gilbert Melendez by unanimous decision to improve his professional record to 26-14, posted a picture of him with McGregor's mum, Margaret - simply captioned #YourMomKnowsWhoDaFook.

The tweet divided opinion, with some of Stephens' 50,000 followers pointing out that it only took him "a year to come up with a mum joke", while others replied it was "well worth the wait".

McGregor earned a reported $138 million from his boxing debut against undefeated Floyd Mayweather Jr in August.

The Irishman lost by technical knockout in the tenth round of the blockbuster fight but earned plaudits from across the globe for his display.