upper decking 

The process of taking a shit in the tank of a toilet instead of the bowl so when the next person flushes, all the shit goes into the bowl

Taking a shit in the tank instead of the toliet is upper decking.

upper decking by Jay December 26, 2003

Upper Decking 

giving John Barrowman a blowjob on a transatlantic flight

"In the middle of the night ... on a 747 on the upper deck" (hence the term "upper decking")

Upper Decking by qwapos September 7, 2012

Upper Decking 

Deficating in the tank of someone's toilet, rather than the bowl. Often employed in malicious context.

Suzy could not figure out why her toiled would flush only brown water. Little did she know that Johnny had upper decked that bitch the previous night.

Upper Decking by Korthos July 27, 2004

Upper Decking 

The precise positioning of the penis between a woman's breasts in a stimulating effort to achieve sexual climax.

I can't believe Jake Upper-Decked Carol Cartwright to get a day off of school...

Upper Decking by Colin January 26, 2004

upper decking 

The act of masturbating with the aid of a woman's breasts.

Oh man, I can't believe he Upper Decked that girl...

upper decking by Colin January 22, 2004

Upperdecking 

Removing the lid of the back of someone's toilet and shitting in the clean water. Results in shit running into the boil with every flush

That bitch pissed me off, so I upperdecked her shitter

Upperdecking by Dan April 5, 2004

Upperdecking 

This one takes practice. This maneuver requires a toilet with a tank above it, like the ones in most homes. Instead of crapping in the bowl, you shit in the tank. Now don't flush. When the following victim flushes, the rancid waste fills the bowl. If you play your cards right, it may ferment. Great prank for those lame partys.

"I gave that toilet a nice upperdecking, Just wait till she comes outta there"

Upperdecking by CharlesVA August 5, 2006