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.
by Irrelevant March 19, 2005
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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.
by holio March 5, 2008
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A term used to explain oral to anal sex in a very passionate sense, as in when you bury your face in your significant other's ass like it's your last chance at survival.
Dude, did you hear about Scott at that party Saturday? He got so hammered that he started gas-masking Jessica for like, two hours! What a legend!

Have you ever SEEN Kim Kardashian? Of COURSE I'd gas-mask her ass!
by Iguanareah September 21, 2018
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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!!!
by CJR1009 January 11, 2016
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When one splatter farts into a hotel provided shower cap and sneaks up behind a loved one and pulls it around their face like a gas mask.
My wife was screaming at me so I gave her a Talahassee Gas Mask to calm her down.
by The Great Mistini March 30, 2015
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To shit inside a shower cap, and sneak up behind someone. You then hold them back and put the shitty cap on their face like a gas mask.
I'm tired of my roommate giving me Tallahassee gas masks! I'm never buying a shower cap again.
by GasMaskOverdrive March 22, 2017
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The act of placing your balls on ones eyes and then farting in there mouth.
" I gave Sarah a Trojan gas mask last night, she almost threw up in my anus "
by J.T.000 January 31, 2009
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