Conor McGregor has release a public apology after making a sexual reference about female UFC stars Ronda Rousey and Miesha Tate on Twitter.

The outspoken Irish fighter had been answering questions from fans on the social networking site when one follower asked him, “One night before the world ends…Ronda or Miesha?”

“One riidin dick, one lickin ma toessssss,” McGregor joked in response, a line taken from Dr. Dre’s song, ‘Let’s Get High.’

Needless to say the quip was soon doing the rounds on various MMA forums and gaining the attention of the media, at which point McGregor appeared to realize that perhaps it hadn’t been such a good idea after all and removed the response from his Twitter page.

McGregor later posted an official apology on his Facebook page.

“I would like to personally apologize to both Ronda Rousey and Miesha Tate. This morning I quoted a song on Twitter in an attempt to make a joke, which I now I see was totally unacceptable and offensive,” McGregor wrote. “I have infinite respect for Miesha and Ronda as individuals and as athletes. I have always been a big fan of women’s MMA and the incredible talented athletes that compete in the sport. I regret making this offensive comment and I sincerely apologize to anyone whom I offended, but especially Ronda and Miesha.

The 25 year-old has made an immediate impact in the UFC thanks to a mixture of his fighting skills and his natural charisma outside of the cage, but that doesn’t make him immune from following the rules and it’s likely the promotion will have warned him not to do anything like this again.

It’s possible they could punish him with a minor suspension or fine, but it’s perhaps unlikely bearing in mind that recently Chael Sonnen avoided doing so after making an ill-judged joke about a domestic violence incident between pop stars Rihanna and Chris Brown during an interview on FOX Sports 1.

On that occasion UFC President Dana White warned Sonnen to “cut out the jokes”, and it’s likely that McGregor will be told the same thing.

McGregor, who’s 2-0 in the UFC’s featherweight division so far, is currently out of action rehabilitating his knee following surgery after suffering an ACL tear during his latest fight.

It could be mid-2014 before he’s ready to fight again, though the fighter, nicknamed “Notorious”, is personally targeting a spring return to the Octagon.