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1.
extreme euphoria when pulling in to fill up and realizing prices have dropped severely.
Nikki had a gasgasm when gas prices fell under $1.50 after they were almost $4.00 for so long.
by Iyang February 11, 2009
 
2.
The extreme euphoria felt after the release of gas. Either orally or anally.
1. Hold an extremely pressurized fart for at least 30 seconds.

2. Release.

3. You've just experienced a gasgasm.
by B Lo May 16, 2009