It's an acronym... kinda. Only the letters don't stand for anything... So maybe it's not an acronym.
Anyway basically you are the kind of black person that people typically think about. It's unfortunate, because not all are like this. It's the kind that doesn't tip, doesn't respect anything but himself, thinks that the world owes him something that in fact he has not earned.
Isaac just spit in that ignorant n.i.g.g.a.'s food. Last time he was here he bossed everyone around and left $5.