side bet

The bank also made a side bet on California wineries.

With his other hand he pointed at each man wanting a side bet.

The Texas crew was back on the first tee watching all this, and when an envoy from Colorado came back to see if they would be willing to talk terms about the side bet, they just laughed.

Officially known as a "proposition bet" or a side bet, prop bets are placed either before or during a game.

Officially known as a "proposition bet" or a side bet, prop bets are placed either before or during a game and usually are not correlated to the outcome of the game.