Top Definition
When someone takes a shit in the upper part of the toilet so that next person to flush gets a shitty surprise
I think my prankster cousin took an upper dumper in my toilet before he left last night, i flushed the toilet my piss was gone only to be replaced with diarrhea-water.
#toilet #shit #prank #turd #crap #poop #feces
door Idontgiveashit 8 oktober 2013
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