The world's highest-paid actor made the announcement alongside UFC president Dana White in an Instagram live video, ESPN reports. The so-called "BMF" belt is being made specifically for the bout, which takes place Saturday, November 2 at Madison Square Garden.
"This addition to the company and the brand and to the sport, this BMF belt, I think it's brilliant," Johnson said. "It's so smart and it's just fun, man."
Diaz was the first to mention the "BMF title" at the UFC 241 post-fight presser following his decisive welterweight win over Anthony Pettis. "We’re fighting for the baddest-motherfucker-in-the-game belt," he said. "And that’s mine! So I’d like to defend that against Jorge Masvidal."
The UFC has since marketed Saturday's event accordingly and even posted a detailed "BMF Resume" page explaining why Diaz is the hyped title's current holder.
In the aforementioned Instagram live video, Johnson also teased "something I wanted to tell the UFC fans and MMA community first." The announcement could be related to his tequila line, the name of which was just unveiled by Johnson in his latest Instagram post.
"Ladies and gents, I proudly bring you, Teremana Tequila," Johnson captioned of a photo of he and his team standing in front of the spirit's distillery.
"Tera means of the earth and mana is our powerful Polynesian spirit that guides us. Spirit of the earth. Small batch, hand crafted tequila from our Teremana blue agave, maturing in the highlands of Jalisco, for everyone to enjoy."
"After years of hard work, this blessing is truly a dream come true - but it’s just the beginning and there’s much work to be done. I’m committed with my team to bring you the best tequila, because quality and legacy are what matter most," Johnson said.
We'll be sure to drink it on the rocks.