Dropping a crap in the toilet tank (instead of the bowl).
JJ got so drunk he laid a top shelfer at Angelina's party.
by BendyBendo January 31, 2007
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When you take a dump on top of the toilet tank lid.
I was thinking of taking an upper decker at Carl's house but decided to give him a top shelfer instead,
by MrWizzrd February 24, 2021
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