The feeling of great pleasure after passing a wicked ass fart which has been held for a great amount of time.
Damn. I rotted one so bad, I think I had a fartasm.
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!".
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