Mike Tyson has a brand new music video to match his anti-Soulja Boy diss track ... complete with hot bikini chicks in weird poses ... and even a shot at Floyd Mayweather.
Tyson's barely in the video for "It's Going Down" ... but he did add some brand new verses touting his prodigy, Chris Brown.
Floyd (Soulja's coach) gets it too ... but really, our attention was on the visuals.