For those unfamiliar with it, in MMA beef is spelled D-I-A-Z.

That's because Nick Diaz, the number one contender to the UFC welterweight title, holds no compunctions about trash talking his opponents, even swell guys like Georges St. Pierre.

In fact, the Stockton slugger at one point claimed the French Canadian champion was ducking him. As it turns out, that was enough to get under the skin of St. Pierre, who says he feels "disrespected" because he's "not a coward" and "never ducked nobody."

Business is about to pick up. 

The two will meet to settle their differences at UFC 137 on Oct. 29 in Las Vegas, Nevada, which leaves another two months for Diaz to continue to get inside St. Pierre's head. And while "GSP" says he's "nervous and scared," he's still motivated to fight -- and beat -- the best in the world.