I don't think they say that. I think that's like black people and bicycles. It's more over a stereotype that lives on through humour than anything else.
They must have said it at some point. Where else would it have come from?
Movies, I guess. If not the profession then the profession to immitate it, the latter profession in question being acting. Isn't that always the way in such cases?
That still begs to question why somebody would say it in the first place, even if one were immitating a rapper and were not actually a rapper themselves.
Wait.. you're a pile of shit.. a black pile of shit. Black.. rap.. learning how to better rap.. STOP IT! STOP TRYING TO BE BLACK! WE'RE NOT THE A-TEAM. WE DON'T NEED A TOKEN BLACK GUY!
