1 definition by TNT- DOUG

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.
ayon kay TNT- DOUG ika-27 ng Setyembre, 2006

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