eight-ball

Meanings

1. A pocket billiards (pool) game played with sixteen balls (a cue ball and fifteen object balls) on a pool table with six pockets.
2. The billiard ball, almost always black, bearing the number eight.
3. A portion of cocaine or methamphetamine weighing ¹⁄₈ of an ounce, or 3.5 grams.
4. A black person.
5. A spherical attitude indicator.
6. A kind of spherical microphone.

1. To outplay (an opponent) by potting all one's color balls and then the black (or eight-ball) without the opponent potting a single one.

Etymology

From eight + ball.