1. A wager on the outcome of an event not normally gambled on
2. A wager with someone that he/she will/won't do some task
3. A side bet during a poker game, i.e. a wager outside the normal betting process of the game.
Poker pro Ted Forrest once won a $7,000 prop bet that he couldn't run a marathon on a 115-degree day in Las Vegas.
by Jeff_P May 10, 2006
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