poolshark

Meanings

1. A hustler who disrupts a game for his own advantage, such as by feigning incompetence to attract bets, or by harassing opponents.

Etymology

Used in the title of a 1915 film. Perhaps related to cardshark, which is in turn likely a variant of cardsharp; the hyphenated phrase billiard-sharp appears in The Mikado in 1885, suggesting that perhaps both terms evolved from sharp to shark in tandem.