Usually used in Gambling. To double the amount of a previous bet. Whoever wins will in exchange get twice the amount of the bet before.

Two people arm wrestling, the winner will get $10.

First Guy: Awh you beat me, let's double or nothing.

Second Guy: Okay, lets play again.

Second guy loses, First guy wins double the previous bet, being $20 even though he lost the first time.
by Lateeshaaaa January 4, 2008
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Person One: So we will go out together?
Person Two: Yeah, double or nothing.
by darkcalc October 31, 2018
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Is when someone wants to double a bet that they lost in order to still win money.
Colvin bets Josh in a game for $10. Colvin loses and then calls “double or nothing”. At this point Josh must accept the bet or he receives nothing. However if he does accept it then he will be playing for $20 and Colvin will be playing for $10.
by Humble Beast April 11, 2018
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