Floyd Mayweather -- Talkin' Trash to Jim Jones (VIDEO)

Floyd Mayweather doesn't care how famous you are -- he's gonna talk smack right to your face ... just ask rapper Jim Jones.

The two squared off in a 2-on-2 hoops game in Miami -- and Floyd let his mouth run ... guaranteeing victory over the "We Fly High" rapper.

Jones didn't just stand and take it -- he returned the smack talk ... and a pretty intense game broke out.