Top Definition
The mysterious criminal lurking in the halls of Burnt Hills-Ballston Lake High School, who has become notorious for defecating, and proceeding to thrash it about the walls in a festive manner.
"Dude, have they caught the unipooper yet?"

"The unipooper strikes again!"
by Ryan Esposito November 02, 2007

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One who wreaks havoc on a bathroom or restroom in the same fashion as the Boston Marathon bomber. Also known as a large bowel movement.
See Also: Blowing Mud
"dude I just blew up the toilet like the Boston Marathon, call me the UniPooper"
by RAKtheDUECER April 11, 2014

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.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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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
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