Grumby 

A turd that attaches itself to the inside of the toilet,so that post-flush there are still significant smudges on the porcelain

Oh man,whoever just crapped in here left the gnarliest grumby,there’s a peanut trying to float free

Grumby by MikeLeppo January 27, 2018

Grumby 

A turd, typically quite large

I got a huge grumby licking my shorts!

Grumby by LimeLightGTX August 9, 2015

Big Grumby 

Taking a giant satisfying crap.

After Big Bob ate all you could eat tacos at the local bar, his stomach began to gurgle and decided he'd better take a Big Grumby

Big Grumby by Cramerica Industries January 5, 2007

Jonas Grumby, The "Skipper" 

Jonas Grumby The "Skipper" from Gilligan's Island. Few people know what the Skippers name was. Played by Alan Hale, Jr. from 1964 to 1967 one of the "seven stranded castaways" from the ill-fated S.S. Minnow
stranded on an uncharted island on the Pacific following a storm.

Gilligan: "Skipper"
Skipper: "Yea little buddy"
Gilligan: "The radio said Jonas Grumby sank the Minnow, that's you"
Skipper: "Yes I know thats me Jonas Grumby, The "Skipper".

Jonas Grumby, The "Skipper" by Farsidefan February 14, 2009

big grumby 

taking a large chew of tobacco.

After landing a 52" pike on his tip up, Chuck decided to take a Big Grumby to celebrate the moment.

big grumby by Cramerica Industries January 5, 2007

big grumby 

a disgusting looking vagina

look at her big grumby

big grumby by yardee December 7, 2007

Gumby's Mouth 

When a woman's vagina has lost all elasticity and now looks like the mouth of the Green claymation character Gumby.

"Wow! Look at that old sloppy pussy! It looks just like Gumby's Mouth!!!

Gumby's Mouth by will bitten November 4, 2017