Grayson Gregory was so sure Conor McGregor was going to beat Floyd Mayweather, that he made a tattoo bet...and he followed through!

As you can imagine, Grayson probably isn't the biggest Mayweather fan. He will, however, be forever attached to the legendary boxer, who pushed his record to 50-0 after defeating MMA champion Conor McGregor on Saturday.

So as not to give himself time to back out of the deal, less than 48 hours after the fight, Grayson went ahead and fulfilled his end of the bargain by getting this hilarious Mayweather tattoo.