Grumpen 

The act of being made grumpy.

you talking is beginning to grumpen me

Grumpen by John Syphilis November 17, 2010

Gruppenfücker 

Reserved only for the worst of the worst. People labeled as such are worse than assholes, dumber than idiots, weirder than spergs, more annoying than Bieber, more heinous than villains, and more disgusting than public bathrooms. Most likely all of the above.

get the fuck off the fucking computer, lethargic gruppenfücker

Gruppenfücker by Yopmail User June 25, 2022

Grumper 

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!

Grumperson Jones by Emily Jones-Parker July 28, 2010

Grumping it

When you skip a tutorial in a video game, and get stuck or lost in something the tutorial taught. A reference to Arin (Egoraptor) of the youtube channel Game Grumps, who would always skip tutorials.

"Bro, you're grumping it! You shouldn't have skipped the tutorial."
"Ah, yeah, I grumped it."

Grumping it by queephlosion December 16, 2020

gumpenstump 

A person who is known to be especially goofy.

Little to no athletic ability, agility or coordination.

Completely unsmooth.

I can't believe that gumpenstump is tryin' out for the team!

gumpenstump by k0nflict June 4, 2009

Grumpelstiltskin 

A person who is being grumpy.

"urgh, Steve, stop being such a grumpelstiltskin!"

Grumpelstiltskin by MrMojo82 February 23, 2010