the act of deficating in the water tank of someones restroom, so when they flush, out comes muddy madness
by darby krow February 3, 2010
Valerie was so drunk she did an upper decker in her friends toilet at the party, and everyone smelt it.
by valere March 14, 2008
After I caught an upper decker at Busch Stadium, I went to Dan's house where I left a beefy sewer pickle in the tank of his toilet.
by porknut August 11, 2005
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
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