To take a shit in the top of the toilet, therefore when the toilet is flushed, brown water washes the poop down.
by chops renfer August 22, 2006
(Film Critique). When a movie starts out engaging and has great potential, but then the ending falls apart and the whole thing turns to shit. It's like finding an Upper Decker when you flush your toilet at the end of a party. It's there, and it's shit, you just don't know it yet.
by Britley's Grams February 22, 2016
by Russ151 October 20, 2006
When you have a massive deuce that must come out when your at a big party. You remove the top lid to the toilet, and release all the poo into it. When done, put the lid back on, and walk out like nothing happened.
I just put an upper decker in her toilet, HAHA!
There gonna be lookin for that upper decker for weeks,HAHA!
There gonna be lookin for that upper decker for weeks,HAHA!
by boiiiiiiiiiiiiiiiiiiiiiiiiiiiie January 17, 2006
A modification on the "classic" upper decker. In a public toilet setting (where there are no tanks/commodes), you improvise and shit in the urinal.
by David C August 12, 2005
Besides the common definition... A behemoth, often coiling, mass of stool that grows and grows until finally reaching above the water level of a toilet bowl. Known to be associated with binge eating. Kind of like one of those underwater volcanoes that breaks the ocean surface.
I had the munchies so bad all weekend, btw do you have a plunger I took an upper decker in your shitter and it's backed up.
by evangelicalathiest April 4, 2011
by Ann_Archy September 13, 2018