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When a car is used by more than one member of the family and the person who used the car and drained the gas tank last must pay to refill the tank.
"I don't have enough money to see a movie tonight, I lost a game of gas roulette with my mom."
by Tommy94612 December 25, 2013
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The "game" of trying to decide if you should get gasoline today, or the next day without the prices dropping or raising in your favor.
I lost gas roulette today. I bought gas yesterday at $3.45 and now today it's $3.15.

I won gas roulette today! I bought gas for $2.99 yesterday, and now today it's $3.15!
by Sephia8 August 20, 2015
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