Also referred to as 'Going Up Top,' the act of taking a shit in the tank of a toilet. Common courtesy not to flush. Used TP should be placed inside drawers, magazines, or the tank itself. Feel free to throw in any other items you can find in the bathroom during the process.
"Man this party sucks... I'll let 'em know how I feel with an Upper Decker"
"Dude!! You shit in my toilet" -> "Where else did you want me to go?" -> "Not in the top part you fuck!!"
"Dude!! You shit in my toilet" -> "Where else did you want me to go?" -> "Not in the top part you fuck!!"
by ShitBrick February 24, 2004
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Get the Upper Decker mug.by afokenr March 25, 2003
Get the upper decker mug.the act of taking a shit in the cistern of a pub or restaurent toilet to highlight dissatisfaction at service or food standards.
causes the water flushed into the toilet to be shitty. and lets face it, who is gonna take a turd out of a cistern??? muuhahahaha
by UnCLe_MeLLoN_BaLLs April 7, 2003
Get the upper-decker mug.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 31, 2005
Get the upper decker mug.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 December 9, 2008
Get the Upper Decker mug.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 May 9, 2006
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