The option in a bet where one of the contestants say they would like to play again (whatever they are playing) for double the amount of the original bet or lose everything they're in for.
Two guys playing pool:
Guy #1: Aw, damn! You beat me. Guess I owe you the $50... Hey, wait. Double or nothing?
Guy #2: Sure, bud. Your loss :)
*Guy #2 looses*
*Guy #1 receives $100*
*Guy #2 cries like pathetic emo child*
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