flash fart

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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Flash fart

When you take a flash photo of someone while they are sleeping right before or after someone farted so they wake up to a fart sound and/or smell

She's giving you that look that Tony had on his face after I flash farted him and he yawn-gagged. It's like you're her nightmare in smell form.

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