Cuban fighter Yuriorkis Gamboa took the first loss of his career in late June, in his title fight against Terence Crawford… and also won rapper Webbie a cool million.

The Louisiana rapper tells TMZ.com that he saw 50 Cent (who manages Gamboa) at the fight and laid down a bet right then and there. He says 50 agreed, but when thee fight was over, he didn’t pay up.

“I say ’50, what’s happening?’ I say ‘I got a mil on my dawg,’ ” Webbie says. “Go look it up, HBO. I say I got a mill on my dawg, what!”

Crawford defeated Gamboa with a ninth round knockout in the fight. It’s unclear if 50 Cent was serious, and if he plans to pay the alleged bet.