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9.
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 23, 2011
 
1.
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
 
2.
When you put your balls into your lovers, or your one night stands, eye sockets and navigate your asshole to their mouth. Then release a big ol' stanky bubbly fart into their mouth.
Rhonda was fast asleep after a long rough fun night of some hot sex. Leroy navigated his rear end to Rhondas mouth. Giving her the best Gasmask in world history. Then Rhonda puked all over Leroys asshole.
by Stanky Rhonda June 25, 2010
 
3.
To take a persons head and pull it to your ass and fart on their face.
I just gas masked Anthony. LOL
by murder my sister May 13, 2011
 
4.
1) To cover up the sound of a fart by replicating the sound, or a similar sound several times.

2) To make a sound that sounds like farting again at least once so that the people around you realize that it was a funny noise and not you farting.
"It totally sounded like I blew one in history today when I sat down, but I gasmasked it by rubbing my hand on the desk to make more fart noises"
by LordRaccoon May 26, 2009
 
5.
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
 
6.
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
 
7.
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 06, 2010