by Vanderweasel September 24, 2019

A thick, sticky, dark brown substance with putrid ripe stench oftentimes found within the area between a person's asshole and genitals.
Holy fuck, what smells like a decaying corpus?" "Off courrsee it's the Grundle Tar stuck to Horvach's gooch!!!
by D. P. Dot Dirtbag October 3, 2010

Similar technique to the dirty Sanchez with the difference being where the lint, cheese, and or sweat is scraped from ones grundle area and smeared under the nose or across the mouth of an unsuspecting individual to simulate a mustache or grin of grundle goo.
After a laborious day at work, upon arrival at the divorce lawyers, I greeted my ex wife with a sour grundle grin.
by Basismskister June 28, 2014

My girlfriend was laying in bed because her head was spinning from the vodka she drank so I had to have her stand up to give her the grundle stiltskin she would never forget.
by Forge69 January 18, 2009

During a fart, when air is compressed between the grundle and a hard surface- the air erupts to the nearest exit, usually out the front of the crotch. It is thunderous, not just for the thunderous noise it makes, but also because of the unsettling direction of the blow.
by ceegee2 January 23, 2013

by Gicky September 4, 2007

by Jimmy Dean May 16, 2004
