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1.
A particular type of flatulence wherein the fart produces a short, sharp snap or pop and nothing more, as opposed to a long, drawn out tone or a raspberry.
I leaned back in my chair and accidentally let a snap fart go at the office, but I don't think anyone noticed.

I was walking behind this guy and he totally snap farted and tried to play it off as a cough.
by Talmanes December 01, 2006
 
2.
A completely unexpected fart which is not allowed to completely be expelled. Instead, immediately and conscieously cut off by the ass cheeks Thus, making a "snap" or brief, high pitched sound.
"She tried to pretend it was her shoes but I know damn well that Matilda from the accounting department let a snap fart in the lunch line!".
by chicachica_boomboom April 18, 2009