Top Definition
A very humorous word for poop.
Damn it, I just stepped in the biggest pile of grumper!
by benwad934 March 30, 2004
A new social networking site that is growing in popularity. Where the Internet goes to complain.
I posted a grump about swine flu on Grumper. You should check it out and grump it.
by Asyra June 10, 2009
A defecation that requires mass force to expel.
Oh man, I can tell this one is going to be a real grumper.
by John Clever November 27, 2002
Addictive website where you can complain about things that annoy you.
I like to use all the time!
by SexualVegan6Love9 June 28, 2009
1. A grumpy person 2. Totally lame.
1. Did you hear Denise whining about her hair? She's a total grumper.

2. No more pudding cups? Grumper!
by jatty July 19, 2009
Any toilet, outhouse or fecal collecting area.
Drew just laid a lincoln log in Cab's grumper.
by Phartman February 28, 2013
Hilarious synonym for anus.
I stuck it in her grumper.
by grumperthumper April 25, 2008

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