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 variation of ball sacking where you spread your scrotum over your partners face and fart.
He held me down and gas masked me. It was disgusting.

I hear that guy is into gas masking, that is not cool!
by SilentNine May 2, 2010
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Drug paraphernalia used to smoke marijuana. To make it, one must take a regular military gas mask, but attach a bowl piece to one side. This allows whoever is wearing the gas mask to inhale marijuana, then exhale the smoke without blowing the pot out of the bowl piece. Another effect is mask creates a hotbox.
Yo, Trevor just got this awesome gas mask. You should come hit it.
by Shawn Maglicic March 15, 2006
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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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when someone farts into their hand, and smuthers it on to you nose.
brother: farts in his hand
brother: comes toward you and gives you the gas mask.
you: *BARF!*

its pretty self explanitory.
by yo'layla June 26, 2007
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after a long hard sporting event, the athlete takes the cup out of his jock strap, and procedes to shove the cup over a fellow teamates nose and mouth.
fuck that asshole, i hated when rich gave me that gas mask last summer
by Jermaine Rutt July 3, 2006
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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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