[[tmz:video id=”0_xeir9p0f”]] Floyd Mayweather Sr. is popping out swingin’ at Justin Bieber — saying the pop star does not know a DAMN THING about boxing if he thinks Conor’s gonna go the space. Remember, Bieber — Floyd Jr.’s longtime good friend –…
Floyd Mayweather Sr. Rips Justin Bieber, 'He Don't Know Boxing!'
