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(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
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Jun 22 Word of the Day
Taken in the contest of the song Baby's Got Back by Sir-Mix-Alot he is referring to Florence Griffith Joyner a track athlete in the 1988 Olympics who defiantly fits all the other descriptions of what he likes in women mentioned in that song. Not some soda why on earth would you want to keep your women like a soda anyway?
You can have them bimbos,
I'll keep my women like Flo Jo
by Pdough May 15, 2006
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2
We gave the stupid little freshman a wedgie after he asked us where the elevator was.
by Popsicle May 18, 2004
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3
verb: to sneak up behind someone, grab their underpants, and yank them forcefully upwards causing their underpants to get jammed up way deep in their butt crack.
dude, did you see what happened to that new fat kid on the playground? He got a grundy so hard it ripped the elastic off his nuthuggers!!!
by shellacked June 17, 2008
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4
Reference to one's huge ego. Typically paired with English/Scottish males named Joe.
"Wow! He seems a bit far up himself!"
"Yeah he is a bit of a Grundy."
by Twollamas May 15, 2017
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5
a person who cant count money correctly
wow we have 200 pounds, no mate thats a ton.
by M January 27, 2004
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