The look on a woman's face when you fart while she is blowing you. Synonymous with fart frown, shit-gas scowl, or gas grimace.
Super-sized bean burrito... $5.00. The gas shock on her face when you blow down on her while she is blowing you... priceless.
by -HEF- September 20, 2009
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Gas Shock
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when a guy is doing another guy in the ass, and then the guy thats getting piledrived in the ass farts, and the gassy vapors enter through the the other mans penis, causing the gassy shack effect.
by valor November 14, 2003
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