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?
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Usually used when someone who is drinking a nonalcoholic beer is too drunk to walk and drive
Jerry: duuudeZ, Im s00ooo drunk broz!11Q1 Wh0s the desugnat3d driver ton1ght, cuz im wheyyyy to trashed
John: But jerry...Its nonalcoholic beer
Matt: He must be a Non alcoholic drunk.
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