Conor McGregor fans hilariously talked smack about Nate Diaz while he was standing right behind them in an epic skit on Jimmy Kimmel Live.

Diaz appeared on Jimmy Kimmel Live ahead of his blockbuster rematch with McGregor back in 2016, and the Stockton slugger didn't disappoint.

He brilliantly sneaked up and surprised McGregor fanboys as they were talking bad about him to a reporter.

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Image: Jimmy Kimmel Live

Image: Jimmy Kimmel Live

Image: Jimmy Kimmel Live

The first fan quickly changed his tune on Diaz after he showed up while the next guy awkwardly stood next to him after saying McGregor will win by knockout.

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Image: Jimmy Kimmel Live

The highlight, though, is the final fan who looked like Austin Powers with Diaz poking fun of his appearance.

"This is America, motherf**ker. Hey, you look like Austin Powers," he exclaimed before walking away and saying: "F**k Conor."

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Of course, McGregor went onto exact revenge on Diaz by outpointing him in a five-round war at UFC 202.

The American then sat out the next three years before returning at UFC 241 where he defeated Anthony Pettis which set up a 'baddest motherf**ker of the Octagon' clash with Jorge Masvidal.