A Dirty Mott, AKA Upper Decker, is the disturbing act of defacating in the upper tank region of a toilet. While something of this nature requires superb balance, bowel control and ass-eye coordination, perhaps the most important skill is simply the balls-out willingness to shit in someones toilet tank.

"Good god, somebody hit our toilet with a dirty mott!"

"What the fu..." Blake trailed off in disgust as he realized the brown substance flushing INTO the toilet bowl from the tank was the result of a dirty mott.

Dirty Mott by the fear boners January 26, 2014

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Dirty Moped

Someone you have sex with that is not only unattractive or obese but smells or is sweaty. A fun ride in the sack nonetheless, that is until your friends find out.

'Oh gross that dirty moped smells. I would still give it to her though, but no one must ever know of this"

Dirty Moped by The Firezombie August 19, 2007

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Dirty Morberg

The same as the Morberg, with the only difference being that the male receives a sloppy rim job while titty fucking the girl.

"Did you titty fuck her last night via the Morberg?"

"It was a Dirty Morberg, she licked my asshole at the same time!"

Dirty Morberg by Token_the_Black_Cat July 4, 2007

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dirty moffatt

When a man (not neccessarily but usually a tech teacher) takes a dildo, (usually made of wood) and sticks it up his ass while masterbating. After coming, the man pulls out the dildo, and then, with a left-to-right motion, whipes it on his moustache.

bradly gave himself a dirty moffatt on the snowday.

dirty moffatt by Alejandro Fernandez December 14, 2008

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