eight-ball

Short definition from Wiktionary

Noun

1. 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. 2
   The billiard ball, almost always black, bearing the number eight.
3. 3
   A portion of cocaine or methamphetamine weighing ¹⁄₈ of an ounce, or 3.5 grams.
4. 4
   A black person.
5. 5
   A spherical attitude indicator.
6. 6
   A kind of spherical microphone.
7. 7
   Alternative form of eight-ball.

Verb

1. 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.