An African-American term that originated in the hoods of Chicago in the late 1970's. "Trick Off Money" refers to money that a husband makes "on the side" that his wife knows nothing about. He uses this money to buy things like beer, weed, or lap dances.
"Yo, DeAndre! Let's hit da club, G! I just made me some trick-off money playin' dice. You in, B?"