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
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
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
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

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