Tip drill

It must be yo ass, cuz it ain't yo face. You's a tip drill, Bitch you's a tip drill.

He is saying that the reason people are having sex with her is because her ass is big because her face is not cute. A tip drill is that girl.
heathazaballer
a woman with an ugly face but a nice body (probably big ass) who serves one man after another
most ballinest ...
a tip drill is what they in the rap world call giving a stripper a dollar for her to rub on you, in this case the girl in question obviously has a large butt and an ugly face so Nelly is saying that shes not good for much more than grinding on him
diesel75