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The Grundle, also known as the Gooch, is the small section of skin located between your anus, and your scrotum. Grundlefur is the patch of hair that usually manifests itself in this region. Often times the Grundlefur is shaven.
"Bro, did you shave your grundlefur today?"

"yeah bro, like 15 minutes ago."
by Grundulfur July 27, 2009
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