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To have been put in a bad or grumpy mood by an outside force. When for whatever reason things in your environment have pissed you off.
"For fuck's sake you are in a bad mood, who grumped you?"
Grumped by Byetor May 13, 2016
Related Words

game grumped 

Game Grumped is a term used for when someone, instead of sitting through the tutorial, skips the tutorial and goes through the Game without knowing what they are doing.
"Don't you want to know what to do?"
"Nah, I'm just gonna Game Grump it by not going through the tutorial."
Game Grumping or Game Grumped it is when someone doesn't go through the tutorial of a game.

Forrest gumped 

A way of making it through a situation successfully through sheer dumb luck.
He really forrest gumped his way into that job.
Forrest gumped by rlampani January 5, 2009
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.
Grumper by Alexdlegit March 25, 2017
Gramped is what happens to a man when he becomes a grandfather for the first time.
My daughter gave birth to a beautiful baby girl. I got gramped!
gramped by Cyprus Denton Fekks November 23, 2010

Grumperson Jones 

An extremely grumpy, cranky, or unhappy individual.
Watch out, Greg is a Grumperson Jones today!