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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

Grumperson Jones 

An extremely grumpy, cranky, or unhappy individual.
Watch out, Greg is a Grumperson Jones today!
Diapers for the elderly. Depends undergarments. Grandpa+Pampers= Grampers.
You smell that, that old bastard just crapped his grampers.
grampers by Larson November 9, 2006

Grumpelstiltskin 

"urgh, Steve, stop being such a grumpelstiltskin!"
Grumpelstiltskin by MrMojo82 February 23, 2010

Niagara Grumper 

An explosive shit. Comes pouring out of your ass with seemingly no end to the flow. Like a hot waterfall of shit.
I ate some bad oysters last night and today I experienced the worst Niagara Grumper. I couldn’t get off the shitter.
Niagara Grumper by Eaton Holgoode January 25, 2018

Grumpelstiltskin 

a play on the name of the dwarf character in the classic Grimm Brother's fairy tale which is used to label someone who is pissed off for an insignificant reason

use this term to further aggravate someone who is already excessively angry for unimportant reasons; personal amusement comes from watching the Grumpelstiltskin become more angry and frustruated upon being called this name

Sally(angry and irrational): OH MY GOD! Someone ate all the Special K! I'm gonna f'n kill someone! All I wanted all day was my fucking cereal! I HATE THIS!!!

Sarah(calm and cool): Simmer down, Grumpelstiltskin.

Sally: Fuck you! I hate you, you cock-juggling thunder cunt!...(continues to yell and scream and hate on Sarah)
Grumpelstiltskin by Jessie L June 13, 2007