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Related to eight ball: behind the eight ball
1. One of the numbered balls used in the game of pool, and the last one supposed to be hit into a pocket. And now, for the win: eight ball, corner pocket.
2. A billiard game in which the winner must hit seven balls into the pockets followed by the eight ball. Pocketing the eight ball before any of the others results in an automatic loss. Here's a pool cue—do you know how to play eight ball?
3. slang One-eighth ounce of an illegal drug (often cocaine or an amphetamine). I scored us some eight balls from my dealer.