Top Definition
The mutual passing of fecal matter from one person to another, through a passionate kiss.
Let's start mud balling till we puke!
by mud ball November 16, 2007

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And upgraded form of tea bagging. This is done by covering one's own testicles in fecal matter before placing them against the face of the victim.
"You goin' to let him get away with mud balling you?!"
by Mistearea April 26, 2013

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When you poop into one's ass and they reciprocate the poop and it gains in mass as it travels back in forth.
Steve "I'm gonna poop in your butt."
Lindsay "I'm gonna poop it back in your butt"
Steve "Mudballing. Hawt."
by Shadow Kunai June 11, 2011

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

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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