Grinchism 

The science of practicing the evil deeds as such as the Grinch.

The yard was vandalized with Grinchism.

Grinchism by Lacey Lou Whu April 3, 2016

grinchitude 

Adopting a view of disdain or scorn towards Christmas and the Christmas spirit.

It's time those liberal lefties dropped the grinchitude and got into the Christmas spirit.

grinchitude by Patrick E. Parker December 10, 2008

Gritchim

Gr-ii-ch-em - A word to call a group of idiots.

Look at all the gritchim over there!

Gritchim by The_True_Retardatiojm February 6, 2021

granchism

When the dumb person in your friend group says something they think is clever, but is actually just a dumb remark that makes no sense.

“I could care less about your feelings right now!”
“Good job dumbass, you just tried to be insulting, but instead created another granchism. It’s “I couldn’t care less”.”

granchism by Dani Drake February 8, 2019

Gripchimps 

Essentially the hands of a climber. A climbers hands are a kin to sticks like shit

I nearly slipped from the ledge but my gripchimps kept me locked in

Gripchimps by Teamsasquatch November 11, 2013

French Grinches 

The grinches in the super modeling industry.

Jack…I want you to paint me…like one of your French grinches🥺

French Grinches by Beetle fetus December 16, 2022

Grinchin' 

To be downtrodden, pessimistic, or negative. Can be a general attitude or a response to another person's idea/comment/experience

Man...why you grinchin'?
What's with the grinchin'?
You always grinchin'.

Grinchin' by Big Ugg October 24, 2008