1. Wrinkley Crinkley upside-down valley of skin, containing hair, between the cooter thing and little anal guy.
2. The Grundle Game; the act of randomly punching people's grundles;
Grundle Punching.
Eric Johnson and I punch each other's grundles, and share a mutual love and bond; Sometimes we play "Crotchball" and have to ice our grundles.
by Playa Seventh April 12, 2004
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Referring to the potency of an individual's grundle at any given point. Grundle game is produced, and at it's peak, after a sweaty workout with da boyz.
Bruh, I was reppin some mad grundle game after that workout this morning.
by Furdaboyz June 16, 2017
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