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1.
Up your poop shoot....usually a penis or penis shaped object
"Does that feel good Up the dumper?"
by David and pals December 18, 2004
 
2.
the term "up the dumper" means any person who is really dumb or gay and that they like dicks in the ass.
Robert likes to go up-the-dumper every night.
by beesnees November 22, 2007