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 02, 2010
Top Definition
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 Peter Stiffins May 09, 2015
Covering your nose with your shirt to mask a fart.
After Max released a monstrous and Gervy fart, we all had to start gasmasking or we would have all died.
by dsmueller November 25, 2014
The Art Of Gas Masking Is Farting In A Hat And Quickly Pulling It Over Someone's Face To Create A "mask" Full Of Raw Natural Ass Gas.
(Work's Best When Victim Is Dazing Off)
"Logan Was Falling Asleep Last Night , So I Had To start Gas Masking Him To Wake Him Up."

"It's A New Form Of The dutch oven"
by superpoopertrooper July 13, 2013
after sex, the guy stretches the vagina or rectum of their partner over their mouth and nose and suck out their own ejaculate...
When thir long session ended, Leroy pulled Samantha's Vagina over his mouth and gave her the best Gasmasking she had ever had.
by wolfsbane6654 May 09, 2011

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