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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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Jul 6 Word of the Day
Phrase meaning that a deceased cannot rest in peace until society changes due to the circumstances of a death.
People said rest in power for the unarmed man had been shot by the police.
by FooBarBiz October 12, 2017
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2
v. The leaving of fecal matter in the tank of ones toilet, turning the water brown. Primarily done as revenge or a drunken practical joke, but sometimes in an emergency when the bowl is clogged.

n. The shit that is left in tank during such an act.
I got so wasted last night I upper decked Sean, his bathroom is going to stink for weeks.
by Lama March 08, 2003
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4
When you take the top off a toilet and shit in it so and replace it so when the next victim flushe's instead of becoming clean it fill's up with shit..
This dude pissed my off so I gave him the ol' upper deck..
by Dave Buttox May 05, 2004
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5
Where you go to someone's house, shit in the tank part of the toilet. the shit in there starts rotting, and starts smelling up the bathroom, and people don't know where the smell is coming from because they never look in the tank part of the toilet.
I took a crap in CJ's Top Tank and left him a Upper Deck he will never forget.
by William Wood July 19, 2005
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6
The act of excreating a log of fecal matter in upper deck tank of a toilet.
Usually as a prank or in desperate need if the toilet is plugged or dirty.
I took a shit in my friends upper deck and it stunk up the bathroom.
by Anthony April 16, 2004
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