In gambling, a "proposition bet" (prop bet, prop, novelty, or a side bet) is a bet made regarding the occurrence or non-occurrence of specific phrases,actions etc:during a game,contest or event.

Example: I bet Donald Trump will say "wrong",10 times during the presidential political debate and the Hillary will smile 5 times at something Trump says.


http://ftw.usatoday.com/2016/10/donald-trump-hillary-clinton-prop-betting-odds-fox-news-analysis-what-time-does-the-third-final-presidential-debate-start-what-channel-live-stream-moderator-2016-election

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