The space between your sack-o-nuts and your whale hole.
When you are crapping you sure are lucky that your grundle is there or you would have a shat full of mess.
by Hansel February 10, 2004

(n.) the grundle is the area between your balls and your asshole. it can sometimes be referred to as the gooch, gouch, or gleek
by John Muth June 1, 2006

The grundle is not simply just the area between the testes, and the anus, rather it's the wormlike skin line.
by Chodester July 16, 2003

After eating at the Harris Millis Dining hall at UVM, the rumble in your stomach, followed by feeling nauseous. Can include grundle shits the next day.
by Curiousity3 December 17, 2011

by g. rundle April 9, 2021

by Alex February 19, 2005

by Andy motherfucking Moseley February 10, 2009
