When you cup your hand around a fart and enclose the hand around your friend's, girlfriend's, or any number of people's nose and mouth.
Yo bro, you just got gas masked, and it smells terrible.

Aww man, I just got gas masked.
by Greg April 24, 2004
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A delightful combination of two well known activities; Arabian Goggles & The Gunner. This is achieved by gently placing the gonads on the respective eye sockets of the eagerly waiting recipient while simultaneously lowering the anus and spreding the corn hole wide over the nostrils of your partner. The gas mask will provide you with endless hours of pleasure and entertainment.
The other night the Brucer got crunked and woke up wearing Smellvilles gas mask.

Pirate Speak...

"T' other night t' Brucer got crunked and woke up wearin' Smellvilles gas mask, Yaarrghhh"

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The act of sitting on the woman and putting a testicle on each eye and your butthole on her mouth. The man then procedes to fart in her mouth and suffocate her until death. The man then chops her up into little peices and put in a trash bag which goes in the dumpster.
Dude, i have to escape the country cuz i just gave Josie a Gas Mask.
by billy Biggsbee June 29, 2010
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The girl has her head in a pillow and ass in the air. You put your mouth on her peach hole and your nose in her A-hole. Then just start sucking and snorting like mad man (or woman).
Last nicht I saw my dad do a gas mask on my aunt.
by Adam Harigast February 2, 2005
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Schmutz that you put on your face, but never f-sag
If you want to know how to properly use a gas mask go to the israeli military
by Sexydimma June 25, 2022
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Holding in your fart around girls or a new girl you're hanging out with. Once 4 months pass by, it is acceptable to unleash the fury of your anus upon her.
Hey Matar,
Oh key Alek what's up?
I was hanging out with a new girl today, but I had the WORST farts. I was Gas-Masking the whole time.
by Mel Gibson Killers March 1, 2021
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The action of cupping your anus with your hand farting and then clenching your hand into a fist so none of the fart can escape. after you simply cover someones face with your hand or gently toss it in the direction of there nose so they can wear your gas mask.
my little brother is sitting on the couch enjoying cartoons when i fart in my hand sneek up behind him and cover his face giving him a gas mask.
by dj fraustin March 24, 2011
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