Gruntiest 

Posessing great power. That which is very powerful, often referring to an engine, car. But may also refer to things being just great in general.

Man that engine in that car has a lot of grunt! It's the gruntiest thing here!

Gruntiest by Boops! June 11, 2023

Grunfest 

Its a holiday on the second Sunday of June. Its when men decorate there Grunskins with paint and glitter in honor of that body part. In tradition a man is suppose to have a woman lick it 14 times before painting.

I have been to 5 circle jerks, to goat ropes, but never a grunfest.

Grunfest by Dr Grunskin July 13, 2010

reg grundies 

Australian slang for underpants.

Dont forget ya Reg Grundies mate.

reg grundies by Matoman February 18, 2017

Gruties 

moist melty crusty humans

mate that’s acc gruties

Gruties by johncenasuncle April 20, 2022

The Grunnies 

An alternate spelling of the grunnys.

I can't eat cheese. It gives me the grunnies.

The Grunnies by defenestrator March 22, 2005

Grunkies 

Faces made of a single pile of sand. Pebbles, shells, sticks and seaweed are used to define facial features such as nose, eyes, mouth, ears, etc. Grunkies are meant to be a little grotesque. They are said to keep watch over swimmers and protect them from dangers, such as the undertoad.

Sean: Though we built three grunkies, you should still be careful of the undertoad.

Grunkies by RedFieldsOfNone October 24, 2011

grundies 

(Australian): Underpants.

Derives from Sydney Rhyming slang, "Reg Grundies = Undies", which is a reference to that excellent Australian TV production outfit Reg Grundy, behind such televisual classics as Neighbours, Home and Away, The Sullivans, etc.

From "The 12th Man Again", wherein commentator Max "Tangles" Walker discusses the perils of prolonged bouts of commentating on international cricket competitions:

"when you're sitting around in the commentary box for this length of time, it's not unusual, really, for the old cods to maybe nod off, get a bit numb; I think the best thing to do in situations like this is to get up, stretch the old legs; maybe even try to casually slip the old hand down and, maybe, give them a bit of a rub; probably try and adjust the old reg grundies while you're down there; try and loosen them up a bit. Anything, really, to try to get the old circulation going again."

grundies by Blind Electric Ray May 3, 2005