by BigL830 August 18, 2017
by FamousJew October 29, 2020
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 07, 2003
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
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
When you take a crap in the tank of someones toilet instead of the bowl. Most often done to a sworn enemy or to your best friend.
by Helvis September 16, 2003
mike was really pissed that the land lord was evicting him. So he left him an upper - decker.
Jim wanted to get back at his best friend Steve for sleeping with his girlfriend, so he left him an upper - decker.
Jim wanted to get back at his best friend Steve for sleeping with his girlfriend, so he left him an upper - decker.
by TNT- DOUG September 27, 2006