Grumpstink 

When a person throws themselves into a tantrum of such ferocious proportions that they inadvertently pass wind.

"Dude, Ashton went off the rails so bad last night that she pulled a grumpstink! My flat still hums of it."

Grumpstink by Prof. S May 4, 2010

Grumpasalty 

A Grumpy old man who hates weebs and Anime

Did you get banned from the server? Yea a Grumpasalty found out i like anime

Grumpasalty by alexalas March 19, 2019

Grumpstep 

A musical sub-genre that consists of (normally) electronic remixes of audio clips from a famed Youtube channel, Game Grumps. Such songs include "Goof Troop Boof", "Banana Shoes", "BaBoom", and "Ice Hair".

Dude 1: Aw, man! Did you hear that Grumpstep song by xXJerryTerryXx?

Dude 2: Which one? Banana Shoes?

Dude 1: Yeah! I had that song stuck in my head for a whole week!

Grumpstep by Random_Grumpling November 11, 2012

Game Grumps 

A let’s play YouTube channel staring Arin “Egoraptor” Hanson and Danny “Sexbang” Avidan. Their episodes often involving silly voices, jokes, running gags, making fun of games (typically Sonic the Hedgehog) and insightful advice and life stories. Also shows by the name of Steam Train, Grumpcade and Steam Rolled appear in the channel, although not as frequent, it is also expected for the channel to have various random segments every now and then.

Do you watch Game Grumps?
Who?
You know the let’s play duo involving that one animator and musician?
Nope.
The two dudes who could be in a Pantene commercial .
OH, GAME GRUMPS

Game Grumps by NotEditedbyMattandRyan February 7, 2018

grumpasaurus 

a grumpy person. may or may express said grumpiness with non-human like grunts and sounds. definitely pouty and brooding.

An unexpected snowstorm in April turned Graham from a happy, human boy into a decidedly brooding grumpasaurus.

grumpasaurus by Siducci December 24, 2008

Grumpus 

A terminally grumpy person, often genetic. Can be modified for various states of grumpitity.

Cheer up, don't be such a Grumpus!

That Grumpus has been growling at me for hours.

A Slumpus (A sleepy Grumpus)

A Lumpity Grumpus (A lumpier than average Grumpus)

Grumpus by Dar123 January 2, 2009

Grumpasauras 

Grumpy in a cute, set-in-your-ways kind of way.

He's not mad at you; he's just being a Grumpasauras.

Grumpasauras by Snewz June 24, 2008