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This little number is where you make your hand into a cup shape and fart into it. Close the cup(your hand) and put it over an unsuspecting persons face. The look on their face not only from not knowing what the hell your doing and the awful smell with be a sure win for making you laugh.
I just gave your mother the gas mask and she puked all over
gas mask by b14ck1c3 September 14, 2008
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While receiving a blow job, just before climax, a man turns quickly and farts in a females face and spins back and cums on her face to mask in the scent
*fart noise, followed by ejaculation*
"POW! Gas Mask."
Gas Mask by Berkson January 17, 2009
When someone farts into a cupped hand then places it over someone's nose and mouth.
Man, I just about lost my lunch when Jim gas masked me .
Gas Mask by J. Rotten October 17, 2017
The use of one's shirt collar, pulled up over the nose and mouth, to protect one from the stench of a recent fart. May also be pronounced "jayse" mask.
Dude, I totally just tooted. Gas masks ON.
gas mask by Irrelevant March 19, 2005
when you capture your fart in your hand and put it on someones face
"last night i gas masked my friend. he had to smell my fart.
gas mask by holio March 4, 2008
When someone is eating out there girl and she wraps her legs around his face and queefs in it
Guy 1: When i was eating her out she gave me a nasty smelling gas mask

Guy 2: THATS NASTY!!!
Gas mask by CJR1009 April 21, 2016
A type of foreplay. When a male farts in a females mouth. The female then blows the fart back into the males mouth and make out.
"Oh man, I gave her a gas mask last night!"
Gas Mask by Freygod 2009 June 21, 2008