Top definition
A very humorous word for poop.
Damn it, I just stepped in the biggest pile of grumper!
by benwad934 March 30, 2004
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2
A new social networking site that is growing in popularity. Where the Internet goes to complain. www.grumper.org
I posted a grump about swine flu on Grumper. You should check it out and grump it.
by Asyra June 10, 2009
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3
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
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4
Addictive website where you can complain about things that annoy you.
I like to use Grumper.org all the time!
by SexualVegan6Love9 June 28, 2009
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5
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
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6
An especially hot and steamy shit. Grumpers often leave you very sweaty and exhausted. They're mostly taken under less than ideal situations like port-o-johns and bar bathrooms.
Man I was tailgating on Saturday and I had to shit some fierce. I went to the port-o-John and dropped a fiery grumper. My asshole was never the same.
by Alexdlegit March 25, 2017
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7
Any toilet, outhouse or fecal collecting area.
Drew just laid a lincoln log in Cab's grumper.
by Phartman February 28, 2013
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