grundlebeast 

The grundlebeast:
a creature that dwells in the dark forests of eldermoon.
very tough and unpredictable.

Man, what a grundlebeast grundel is!

grundlebeast by sourDOUgH January 24, 2004

grundlebeard 

This would be the pubic thatch.

Lol, your grundlebeard is all up in there.

grundlebeard by 31d1 September 19, 2005

Grundlebate 

A highly stimulating sex act whereby your sexual partner tightly, but gingerly, pinches your grundle while you furiously and feverishly masturbate yourself. To perform properly, your mate must pinch the grundle between their thumb and forefinger and must tug this fleshy area back and forth and up and down in rhythmic and synchronous harmony to the recipient's stroking and beating of their turgid cock. Said act is known for explosive orgasms but can result in a very sore taint if performed too frequently.

Carl exploded in a body quivering orgasm after his girlfriend helped him get off with a little Grundlebate action. She tugged a little to hard though and Carl's taint was a little tender to the touch the next morning.

Grundlebate by Eaton Holgoode April 28, 2015

Grundleburst 

An awesome band. They rose to fame with they're number 1 hit song, "2 Cool 4 School". Their songs are generally recorded in one take around a single mic, and often improvised (though sometimes based off of snippets of magnetic poetry. The members are as follows:

Mick Furgn: Vocals
Nick Schweinstegger: Guitar, backup vocals
Max Sven III: Kazoo

Their first album, released in 2006, was called Imagine Shlock, and was recorded on two non-consecutive afternoons.

I just listened to Grundleburst's debut album Imagine Shlock and it was so good.

Grundleburst by max sven III August 10, 2006