After gettin mudbutt, term used to show advanced stages of the mb , usually after a long day of walkin on the golf course
Ryan: Dude i gotta sit down i got the grundy rash
Homer: dam son i only got the mb
by Stew-unit June 16, 2007
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Grundy County is a county in Southern Tennessee. It’s about 2 hours southeast from the capital.

Grundy County is full of white supremacists, trump supporters, confederates, sexists, racists, homophobes and transphobes, and a lack of any government. There is exactly nothing good about this place, please never move there.
Person A: Where’re you from?
Person B: Grundy County, Tennessee.
Person A: I’m so sorry for your loss.
by aaronbutworse October 14, 2020
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Small pieces of faecal matter found in grubby underpants.
Colin, having terrible flatulence as well as hygiene was not surprised to find that the frequent release of vaporised turd into his pants had formed into grundy pips. A more polite way of saying "I've followed through and lightly shit myself".
by Spoopleman April 16, 2017
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The act of taking a massive bowel movement other than at a authorized drop zone for terds.
I thought I was going to make it home and take a shit, but I stopped and dropped a mean grundie right on the side of the road.
by Rickastley333 October 21, 2021
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