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

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

Up the Gumpstump 

"Up the Gumpstump" is a saying used to describe a large quantity of anything.

Elderly people are more prone to saying "Up the Gumpstump" than other people. Most particularly when they are stressed about something they have a lot of.

Merged words (gump & stump) believed to be originated from the words gum stump. A gum stump is a stump of a gum or Eucalyptus tree.

Used as an exclamation!

Geez Jim, we've got gophers up the gumpstump!

My my Helen, I have fleas up the gumpstump!

Holy toledo! Mutant Ninja Turtles up the gumpstump!

Up the Gumpstump by *echo* July 7, 2010

Gumpshun 

quick-witted, smart mouthed, wise ass etc.

"My Grandmama used to say 'boy you got gumpshun' " -- Big K.R.I.T

Gumpshun by Misshoneyblunts October 5, 2010

Game Grumps 

An addition to my other definition.
The duo has broken and repaired, but instead of Jon, Danny from NinjaSexParty joined. Fans are not pleased.
RubberRoss has also started a series with Danny on the Game Grumps channel as well, known as Steam Train. Instead of console games, the content it has is of computer games.

Ah man, Danny can never replace Jon in our Grump hearts!

Dude, Danny is a good addition to Game Grumps.

Game Grumps by Garnet June 28, 2013

grumpster 

n. similar to dumpster, but instead where happiness goes to die
n. a person that sucks the life out of the room no matter how hard you try to cheer them up
n. dark pit of despair, a black hole of unhappiness, a vacuum that sucks all hope and joy from the vicinity

MD is a grumpster because he will suck all your happiness away.

grumpster by JitteryJoe July 27, 2008