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
by b14ck1c3 August 23, 2006
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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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To pull a girl's sweet smelling, worn panties over one's head and wearing them around like a gas mask. To Gas Mask correctly, one must pull the panties over the head, exposing one's eyes through the leg holes and allowing the fragrant gusset to rest over the nose the mouth. Gas Masking may be performed by a male or female and may be preferred after certain activities such as running, working out, gardening and other activities that work up an irresistible, tangy smelling, zest.
Stan: Dude! WTF are you wearing on your face? Is that a pair of panties?

Frank: Yea Brrrraaaaaaahhhh!! Muh girl just ran a 5k this morning and I couldn't help but grab them when she got into the shower and do a little Gas Masking. It's irresistible. What a tangy funk she got.
Stan: Sounds zesty Broooohhhhh! Let me mask up when you are done.
by Eaton Holgoode May 8, 2015
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A face mask designed to block all chemicals and dust from getting into your lungs and killing you.
WW1, Germans shoot some chlorine gas mortars, British people put on their gas masks. some dude lost his Gas-mask and dies of rotting lung.
by Gas-mask child December 6, 2010
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To take a persons head and pull it to your ass and fart on their face.
by murder my sister May 13, 2011
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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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