The UFC is creating a REAL custom "Baddest Mother F**ker" belt for the upcoming Nate Diaz vs. Jorge Masvidal fight ... and Dana White says it ain't cheap!!!
"I think it's gonna be like $50,000," White tells TMZ Sports.
Of course, the whole thing came about after Nate Diaz defeated Anthony Pettis in August and, during a post-fight interview, declared himself the 'BMF' champion of the world.
"We're fighting for the baddest mother f**ker in the game belt and that's mine," Diaz said after the Pettis fight .