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.
by Idontgiveashit October 08, 2013

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.