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A species of scrimblo that lives in the Quimbly region of northern Ireland.
DO NOT APPROACH THE GRUMBLO
If you do, it might end up looking like some of that awful "art" people post on DeviantArt. You know what I'm talking about.
"Look! A Grumblo!"
"Oh my God, back up! Those things are dangerous!"
"It's fine...See?"
REDACTED proceeds to touch the Grumblo
"OH MY GOD OH MY GOD PLEASE HELP ME IT'S REDACTED MY REDACTED REDACTED PLEASE HELP ME BEFORE IT REDACTED"
grumblo by Dr. Mass Debater, PhD October 6, 2022
Related Words

Grumblebrag 

To complain in a superficial manner, when one is really just boasting.
I have to wear my wedding ring or else I just get hit on too much. I'm not actually annoyed, I'm just grumblebragging.
Grumblebrag by das Luftkissenboot November 13, 2014

grundle grumble 

grundle grumble ( grundle grumbler, grundle grumbling )

1: When a young lady is pleasuring her partner by kissing or licking his grundle the scrotum will cover the womans mouth preventing intelligible speech.

2: Flatulence that is prevented from escaping up the butt crack that flows over the grundle impacting the scrotum making a distinctive rumbling sound. Grundle grumbles are particularly evident when seated on leather or vinyl seating surfaces or those cheesy fiberglass chairs in laundromats.

3. Mysterious sounds that emanate from the grundle.
1. Whats that honey? I can't hear what you saying you grundle grumbling bitch you.

2. Jesus Dave I heard that grundle grumble from here. Stop farting on my leather seats..no more fucking burritos for you.

3. What the fuck was that? Oh..a fucking grundle grumble. Sorry. Do you have any fabric softener?
A level name in the final world of Super Mario 3D World
Don't look up Grumblump on Urban Dictionary. - RedFalcon, 2021
grumblump by 5003erX March 5, 2021

Redgren Grumbholdt 

A made up person, used in reference to something else, to test if a person is acting like he knows pop culture. The term was first used in Season 2, Episode 1 of Rick and Morty's “a Rickle in time“
Beth: Honey, are you wearing your shirt backwards?

Jerry: What? Uh.. No, I just like my shirt on backwards. I'm not an idiot.

Rick: Wow, that guy is the Redgren Grumbholdt of “Knowing-whats-going-on”

Morty & Summer: *laugh*

Rick: Huh? You like that? You like that Redgren Grumbholdt reference? Yeah, because I made him up. Think for yourselves, don’t be sheep.
Redgren Grumbholdt by thotaroo June 18, 2020

Grumble Flick 

(British) A grumble flick is a form of video based entertainment that allows men to pleasure themselves without excessive use of their imagination.
Jack stayed home and watched a grumble flick
Grumble Flick by WordWright June 21, 2009