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1. An STI.
2. The common name given to lice that inhabit the area known as the grundle or taint. Grundle grunts are usually contracted from illicit sexual behavior or walking around the woods naked.

Grundle grunts are also known as "taint tics", "scrotum skippers" or just crabs. When contracted elsewhere, grundle grunts are named after the area contracted. i.e. pubic lice, chin climbers, nipple nabbers, happy trail hikers, or earwig waggers.
Ouch! That grundle grunt is very friendly.
by Tofu January 27, 2004
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