Nasty; disgusting
When that fat chick spread her legs, that shit looked straight grundy!
by StillBorn May 01, 2003
(Australian): Underpants.

Derives from Sydney Rhyming slang, "Reg Grundies = Undies", which is a reference to that excellent Australian TV production outfit Reg Grundy, behind such televisual classics as Neighbours, Home and Away, The Sullivans, etc.
From "The 12th Man Again", wherein commentator Max "Tangles" Walker discusses the perils of prolonged bouts of commentating on international cricket competitions:

"when you're sitting around in the commentary box for this length of time, it's not unusual, really, for the old cods to maybe nod off, get a bit numb; I think the best thing to do in situations like this is to get up, stretch the old legs; maybe even try to casually slip the old hand down and, maybe, give them a bit of a rub; probably try and adjust the old reg grundies while you're down there; try and loosen them up a bit. Anything, really, to try to get the old circulation going again."
by Blind Electric Ray May 03, 2005
A wedgie.
We gave the stupid little freshman a wedgie after he asked us where the elevator was.
by Popsicle May 18, 2004
Your underpants...
My grundies are soiled
by MH June 06, 2003
Something that is grotty, dirty or generally foul. Also a type of troll or gargoyle.
that fart smells really grundy!!!
by ram jam 1991 May 11, 2011
noun; defecation.
"Oh shit, son. I took a massive Grundy in Maria's bathroom. I dare ya to light a match!"
"Why are you telling me about your shit, bro?"
by infamous weezer January 08, 2012
Way back in the 60's it was a common phrase used for an erection. It was used in reference to the teacher on the Archie cartoon series, Miss Grundy. If your penis was Really hard, it was called a "Grundy" because it pulled so hard on your skin that the leaders(tendons) in your neck showed like the teacher on the Archie cartoons.
That hot chick over there in the string bikini is giving me a Grundy!!
by SMOKINGMAN November 01, 2008

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