upper deck- its when u take a crap in the tank of the toilet. it works best in hotels lol..
ppl do this because it stinks really badly and usually the person tht u do it to, wont find out for a while
ppl do this because it stinks really badly and usually the person tht u do it to, wont find out for a while
by amaragallion89 November 21, 2009

by not all blacks have ebola May 2, 2019

The process of taking a shit in the tank of a toilet instead of the bowl so when the next person flushes, all the shit goes into the bowl
by Jay December 26, 2003

by qwapos September 7, 2012

Deficating in the tank of someone's toilet, rather than the bowl. Often employed in malicious context.
Suzy could not figure out why her toiled would flush only brown water. Little did she know that Johnny had upper decked that bitch the previous night.
by Korthos July 27, 2004

by Jason Spires April 19, 2004

takin the top off a toilet tank and shitting in it and placing the top back on the tank and walking away
by DAVE AND CLARK May 8, 2008
