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Small flap of epidermis directly below the asshole that prevents you from getting shit on your balls.
Without regular maintenance, a grundel will often smell of slightly sweet musk and ball sweat.

grundel bunion 

The gathering of lint or the polling of lint in the grundel or taint area
Man, if I bend over can you check me for grundel bunions ?
grundel bunion by Bjean1128 July 28, 2022