to change someones screen-saver.

The trend started by a group of office workers who changed eachother´s screen saver images to that of 80´s singer Carol Decker.
´we just totally carol deckered that guy´
´did you carol decker me while i was in the bathroom´
by Nikos December 7, 2011
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The act of puking your guts out in a bath tub and/or garbage can while dropping a massive duce at the same time
After many long hours of drinking, we found Jon pulling a dirty decker in the 2nd floor bathroom.
by Nick1234 February 7, 2006
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(v.) to be delicious.
(n.) rediculously hot wrestler for Penn State.
That guy is onnnee hot Jack Decker!!
by likeperfection January 30, 2009
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the act of sneaking into a bathroom, quietly lifting the lid off of the toilet tank, taking a deuce in the tank and then replacing the lid. this causes the toilet water in the bowl to be polluted after each flush. this is usually done at a party or too someone that you despise.
heath snuck into the frat house bathroom and left an upper decker in the tank, much to the dismay of the alpha betas.
by kirk May 27, 2005
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A toilet prank, whereby someone defecates in the refill tank (water closet), causing each additional flush to deliver brown, poopy water into the bowl.
Jim was being such a jerk at his party, so I went upstairs to his bathroom and dropped an upper decker in his toilet.
by bodythunder November 12, 2008
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A variation of the cunnilumpkin in which a woman receives cunnilingus while she deposits feces into the upper tank of a toilet. This is the female version of the blumpkin decker, and is far more difficult.

A combination of the cunnilumpkin and an upper decker.
The hostess of the luncheon offended Mary and in turn embarrased her husband, so the two of them snuck off to the master bathroom did a shameless cunnilumpkin decker.
by Mental Pickpocket October 30, 2004
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When attending a persons home of who you dislike, take a shit in the toliet tank instead of the bowl. This is by far going out of the park and into the upperdeck where it will not be known until long after you depart their house.
When your wife makes you go to her boss's party who you would like to kill, go to the bathroom and leave him an Upper Decker and you'll know who the joke is really on.
by Noah Burnett April 28, 2006
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