Definition 1: The "isthmus" occurs after several weeks of not grooming your pubic hair, when your nutsack, grundel, and asshole grow so much hair it looks like one hairball between your nuts and your asshole.
Usage Example: I better trim my grundel hairs before an isthmus forms in my pants.
Isthmus
Definition 1: The "isthmus" occurs after several weeks of not grooming your pubic hair, when your nutsack, grundel, and asshole grow so much hair it looks like one hairball between your nuts and your asshole.
Usage Example: I better trim my grundel hairs before an isthmus forms in my pants.
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