Ain't got it.

When a brotha come up to U, lookin for some money or somethin' to be paid for & U will not even give this nigga a dime if you had one.

Brother: "Yo, homie let a nigga hold a dolla."
You: "I ain't got it."
Brother: "Ah man, quit being stingy."
You: "I DONE TOLD YOU ONCE NIGGA, I AIN'T GOT IT!"