grundie 

when your underwear goes up your butt, the same as a wedgie.

Sarah has a grundie she has to pick it.

grundie by Kate0304 July 24, 2008

Grundlesac

The flap of skin, in males, between the scrotum and the anus, which can be used for various things such as clipping flashing lights to. Grundlesac's can vary in size from droopy to so small that they can barely be noticed.

Damn Alex, that is so sweet how you can clip that pulsing belly button ring to your giant grundlesac.

Grundlesac by pdiddy July 12, 2004

grundlesnaps 

Crystally, clinging bits of sweat and various fluids that form on the pubic hairs. Differentiated from dingleberry in location and composition.
May be used as an insult or medical complaint.

Nothing is as aggravating as losing a ball-hair to a persistant grundlesnap.

grundlesnaps by Whitebird May 13, 2005

Grundiegreu 

Grundiegreu. A snack or dessert made by mixing peanut butter, honey, and powdered chocolate until the consistency is that of peanut butter. Can be eaten in a variety of ways but is generally limited to hot, cold, with ice cream or frozen.

Tonight I shall be lazy and make grundiegreu instead of an actual dessert.

Grundiegreu is better than chocolate sauce because it has peanut butter in it.

Grundiegreu by TeaKettleUprising January 28, 2016

Green Grungies 

When the food that has been consumed causes your stool to have a very distinct green color. Defacating a Green Grungie can also include discomfort, wetness, and/or strong odour.

Low grade meats and high grease content have a higher likelihood of causing Green Grungies to form. (McDonalds, KFC, etc.)

"Man I've got a bad case of the Green Grungies"

Green Grungies by BubBLeB0y April 7, 2008

grundles 

grundles or grundle shavings are commonly used for the word/s pubes or pubic hair

Eww his grundles were seeping out of his shorts.

grundles by o milinhos July 5, 2008

undie grundie 

The act of inserting a finger or thumb into an unsuspecting victims anus through their fresh new underwear, thus causing a permanent poo stain. If done in a forceful manner, blood stains may accompany the poo stains.

Paul surprised Steve with an undie grundie...a large fight insued.

undie grundie by Mutato January 30, 2008