1 definition by TNT- DOUG

Top Definition
When one takes a shit in the upper portion of the toilet. ( the tank ).
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.
#floater #dirty water wash #dirty water dunking #untidy bowl #nesquick shake
av TNT- DOUG 27 september 2006
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