Noun. To pull ones shirt up over ones nose in a sometimes vain attempt to block noxious ass fumes from entering ones nose.
Shelly just farted so I had to pull my shirt up over my nose to create a fart mask.

"Dude, Bill farted!"

*Pulls shirt over nose*
"Sweet, got yer fart mask on I see!"
by spiralings February 2, 2012
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When wearing tight clothing and farting, you may swing your arms in such a manner that forces the fart out of your collar or hood. bystanders may think your face has just farted and you will carry around a mask of fart for seconds to minutes
guy 1: *farts, stretches arms and abruptly brings arms back to sides, fart emits from collar

girl 1: oh my god! did your face just fart?

guy 2: yea, he'll be walking around with a fart mask for a few...
by sonofluger2 February 20, 2010
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