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?
by Cody Baggs is here October 14, 2007

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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.
by Jestah November 18, 2016

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt