Grumpf

The sound made by the "catcher" when the "pitcher" inadvertently enters the "wrong" orifice.

She let out a loud, muffled grumpf into the pillow when he slipped out and entered the one-way back street!

Grumpf by Backstroke May 11, 2014

Grumpf

The multi colored lint that appear from out of nowhere in you belly button

Gosh, I wonder what I wore that made red grumpf appear today.

Grumpf by Sandei Kirshen October 28, 2003

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