Kiss My Big Black Mocha Ass
To show complete and utter disapproval for something suggested or offered. Emphasis is shown on describing the ass intended for receiving the kiss. Usually used by people of color or "black men".
Guy: "Hey Kareem, can I have your Xbox 360 for free?"
Kareem: "...kiss my big black mocha ass"
Kareem: "...kiss my big black mocha ass"