NATE DIAZ claimed Jake Paul needs his 'ass beat for free' after he called out Conor McGregor.
The YouTube star, 23, ripped into the Irishman as he offered him $50million for a boxing fight.
Paul even aimed a cheeky dig at McGregor's girlfriend Dee Devlin and blasted UFC boss Dana White.
He said: "I know you're probably beating up old dudes in a bar right now or maybe you're j***ing off as you're sick of f***ing your wife, I mean, she's a four [out of ten], Conor you could do a lot better, but happy Monday!
"My team sent you a $50 million offer this morning, $50 million cash, proof of funds, the biggest fight offer you've ever been offered."
Diaz - who has fought McGregor twice - has now responded following the 23-year-old's video.
Speaking on Twitter, he wrote: "Jake Paul you need your ass beat for free you spoiled f***, you can't really fight dumbs***.
"You're gonna end up with your ass whooped for real somewhere talking like that."
Paul, who has amassed 20.3 million subscribers on YouTube, has a boxing record of 2-0.
He sparked out fellow YouTuber Ali Eson Gibb in January on his boxing debut.
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He then called out McGregor after he knocked out former NBA player Nate Robinson in November.
But White has confirmed there is 'zero chance' of the UFC star fighting Paul anytime soon.
Paul has even claimed that he was 'selected by the Gods to be the new Floyd Mayweather'.