1. The hairy sector separating your bunghole from your dilly-dally.

2. A room in a house/apartment specifically for men to hang out at, also referred to as a "man cave".
After a long, hard day of working in the yard, I love to come inside and scratch my sweaty grundle.

Man 1: Dude we've got the Nintendo 64 all hooked up in the grundle! Come over!
Man 2: Cool, bro! I'll bring over some PBR and an extra controller!
by SillySailor500 September 28, 2011
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I was pressure washing my lawn when a wasp came right up to me and stung me right in my grundle.
by Sgt. Wetwipe June 19, 2016
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The undercarriage of the male anatomy, often associated with an odiferous smear referred to as grundle butter; pungent
I’d been riding my mule for hours, and my grundle was hotter than two rats fucking in a wool sock.
by Trail crew December 11, 2022
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There is an erroneous musk wafting from his grundle.
by semondemon69 November 2, 2021
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When a person is disheveled, hungover or a hot mess.
Damm…. She’s being a total grundle
by Dumpsterkitty2 November 26, 2021
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the perineum, especially the male perineum
I tried to shave my grundle but I just ended up making it itch.
by The Return of Light Joker November 19, 2011
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