Gas Shock 

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.

Gas Shock by -HEF- September 20, 2009

gas shack 

something grampas scream in the
middle of the night
unexpectedly

and usually while dreaming

ZZZZZZZZZZZZZZ.....
"IM A GAS SHACK!!!!!!"
ZZZZZZZZZZZZ......

gas shack by alaskadude April 1, 2009

gas shack 

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.

john gased my shack good

gas shack by valor November 14, 2003