Floyd Mayweather warns UFC star Conor McGregor he is going to ‘slap the s**t’ out of him’ when he next sees him

FLOYD MAYWEATHER has promised to "slap the s**t" out of Conor McGregor when he next sees him in an astonishing online rant.

Money, dressed in a vibrant Hawaiian shirt, launched the X-rated tirade on social media.

It came as he offered fans £8,000 for the best caption on a homemade video he posted to Instagram of McGregor tapping out to Nate Diaz.

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And in a separate interview, Mayweather claimed he had gone to McGregor's "boss" about a potential fight.

The 49-0 champ's war of words with McGregor has escalated in recent weeks as rumours of a potential fight between the pair continue to hot up.

But Mayweather indicated he has had enough of the chat when he vented in a video.

He said: "I’m f***ing McGregor up. Punk-a** McGregor. I’m gonna slap McGregor.

"I’m gonna slap the s**t out of McGregor when I see him."

And Mayweather claims the Irishman - recently granted a boxing licence in California - does not actually want to fight.

He said: "I don't fight in California. What did he get a licence in California for?

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"I'm going to tell you like this, he's blowing smoke up everybody's a**.

"He don't really want to fight because I went to his boss. He don't really want to fight.

"He's just doing that to keep his name alive, you know what I'm saying, to stay relevant.

"He don't really want to fight. He's building his followers, but he's smart."