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[Grundy] 

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!!
[Grundy] by SMOKINGMAN March 13, 2009
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We gave the stupid little freshman a wedgie after he asked us where the elevator was.
grundy by Popsicle May 18, 2004
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."
Grundy by Twollamas May 16, 2017
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!!!
grundy by shellacked June 17, 2008
When that fat chick spread her legs, that shit looked straight grundy!
Grundy by StillBorn May 1, 2003
a person who cant count money correctly
wow we have 200 pounds, no mate thats a ton.
grundy by M January 27, 2004