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
Upperdecking by Dan April 5, 2004
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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.
Upperdecking by CharlesVA August 5, 2006
Related Words
Upperdecking
Using the restroom, going number one or two in the water tank of a fellow man's toilet. when he flushes the pee or shit flows out.
Upperdecking by douchebagness May 16, 2007
underdecking
conspiring against an authority figure to take synchronized shits underneath said authority figure's deck. Usually performed in groups of two to five people. In extreme cases, shit burritos are fashioned with paper towels and left to be found.
underdecking by underdecked July 2, 2009
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
upper decking by Jay December 26, 2003
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