Gurmp 

Verb. (Hard 'g' sound, germp)
1. Gurmp describes the gait of someone who is grumpy. A hasty, stomping appearance to the stride that sometimes results in an unevenness that makes their walking seem inefficient. This inefficiency is often an unconscious choice that allows the person to avoid ruminating on their problems by giving them something to complain about i.e. pain caused by their walking unevenly.

Variant 1. Gurmper, similar to gurmp but tends to encompass a scampering, scurrying haste in the manner of walking. As in being chased or needing to arrive somewhere in a hurry.
Variant 2. Gurmple, Similar again but adds an element of scrambling. This would be used in a situation where the person is trying to gurmp in a small space (e.g. in a cave) and needs to be more nimble.

n. Gurmper or Gurmpkin
Some one who gurmps

Harry gurmped to the graveyard. It was cold but the sun could still be seen hanging bright in the sky.He wished he was just about anywhere but here, it felt like work, but not the fun type of work, the boring work. As he walked he felt the pain he always got in his right knee whenever he had to walk further than from his door to the car. He grumbled under his breath about the doctor not knowing what was wrong with it. He was quite grumpy when he finally arrived and wasn't going to stand for any nonsense.

Harry (above) is a gurmper

Gurmp by E-lol March 9, 2011

Gurmp 

Fuckin Noob who just goes around Noob Tubing Non-Noobs. then when they finally get a multi-kill with their Noob-Tube, they think they are the best playa in the game, when really there just a Noob-Tubing Noob Goober

Fred:I just got a multi-kill!

John:wow! how?!

Fred:with a grenade launcher!

John: I vow never to talk to you again in my life. i have completely changed my whole opinion of you and will never look at you the same way, if i even look at you again. I hope that when your old and grey, you will look back on your life and realise that it was just one big EPIC FAIL!. You fuckin Gurmp.

Gurmp by $pac£r?????d May 11, 2010

Game Grump

the art of skipping the tutorial in a game you've never played

i'm gonna game grump it

Game Grump by LiamTAT July 31, 2018

grossie grumpkins

The anonymous old man - most likely suffering from some form of dementia - who takes a shit in the sink of public restrooms

Don't go into the bathroom, Bob. It looks like Grossie Grumpkins struck again.

grossie grumpkins by Betty Wagaman October 15, 2006

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