Top Definition
A fart that happens so fast and unknowingly that there is no time to tighten butt muscles.
Usually by constant laughter
John: So the police officer says 'thats not a donkey, thats my grandma!'

Jerry: LMFAOBBQWTFLOL!11! *flash fart*

John: Yo did you seriously just flash fart?
#fart #flash #lol #did #you #just #like #that? #flashfart
af Cody Baggs is here 14. oktober 2007
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