NEW YORK (REUTERS) - YouTuber-turned-amateur boxer Jake Paul pulled no punches on Tuesday (Dec 15) as he called out Ireland's former Ultimate Fighting Championship (UFC) champion and king of trash talk Conor McGregor in a foul-mouthed tirade that sent social media into a frenzy.

Paul, fresh off a brutal knockout of former National Basketball Association (NBA) point guard Nate Robinson, offered McGregor US$50 million (S$66.7 million) to step into the ring.

"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," Paul said while performing his best impersonation of McGregor, holding a cigar in one hand and a glass of whisky in the other.

"But, you're scared to fight me, Conor! You're ducking me because you don't want to lose to a YouTuber. You're 0-1 as a boxer. I'm 2-0 as a boxer."

Paul, whose brother Logan - also a social media influencer - will face Floyd Mayweather in February in an equally bizarre exhibition bout, also took aim at Dustin Poirier, McGregor's next opponent, with a bizarre claim that his dog had more followers on Instagram than the 31-year-old American.