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
by Dan April 5, 2004
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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"
by CharlesVA August 5, 2006
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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.
The other night we were upperdecking, it was funny as shit.
by douchebagness May 3, 2007
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The malicious act of making doodie in the water tank of a toilet, thus contaminating the toilet's clean water supply.
See http://www.antiupperdeck.com
by ee March 4, 2005
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An upperdecker is when you poop in the toilet tank of someones bathroom, its the gift that keeps on giving
i was at this party and they tried to kick me out so i gave them an upperdecker
by Nick June 17, 2006
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When you remove the upper lid of the toilet and shit in the tank.
Tommy shammed Bobby last night. So tonight Bobbys giving Tommy an upperdeck!
by Squeegie Bandit May 22, 2008
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The upperdecker is a prank that you can pull on a friend or loved one, or more likely someone who deserves it. An upperdecker is defined as defecating in the upper tank of a toilet, allowing it to fester for as long as possible and sending a chilling brown residue into the bowl upon each flush.
At a party where they run out of beer one might like to leave an "upperdecker" to show their disapproval.
by Grant Herman August 31, 2004
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