A mask purposed for breathing in airborne chemicals. Various masks/series of masks include the GP-5, M85 and M40. Gas Masks were mostly used in WW1 and later became a popular military accessory as chemical warfare is rare.
The enemy threw some VX gas and every put their gas masks on in-time.
by Sensei Lenny July 20, 2015
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One of the greatest HipHop albums ever.
Apollo Brown produced it, Journalist 103 is rappin over it and it sounds just fantastic.
Every real hiphop head should have a copy.
-What was 2011's best underground-LP again?
-'Gas Mask' by the Left.
-Ah, right, I must have been listening to the radio too often...
by HipHopHead February 16, 2012
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When a girl is laying on her back and you're facing her feet, you squat and teabag you're balls in her mouth and fart in her her face.
My girl spilled wine on the rug and while she was cleaning it up and I flipped her over and gave her the gas mask.
by bob and ric December 25, 2004
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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
by b14ck1c3 August 23, 2006
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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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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."
by Berkson October 5, 2008
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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 .
by J. Rotten October 18, 2017
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