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Billy Grundy 

An absolute alpha male who most men strive to be like. Everything about him his perfect.
Billy Grundy by Pbateman00 January 7, 2022

Grundy Run 

A tradition seen in New Zealand high schools where at the end of the year, students strip down to their underwear and run across their school grounds (or another school)
Person 1 - "Did you hear? Steve went to the grundy run yesterday!"

Person 2 - "No shit Sherlock, like two thirds of the school went."
Grundy Run by jencii May 4, 2020

Grundaberries 

Men's briefs. Derived from "Reg Grundies" - Australian slang for undies or underwear - and from the concept of storing your berries (testicles).

Also known as sluggos, or budgie smugglers.
These grundaberries are too tight. I hope it doesn't affect my sperm count.
Grundaberries by Honeycut February 6, 2009

Solomon Grundy 

Hairy, squat, laconic Nemesis of Superman
"Grundy hate Superman. Grundy want smash Superman. Grundy want pants, too."
Solomon Grundy by Tim February 6, 2004

Solomon Grundy 

A man who wants some pants.
"Solomon Grundy want pants, too"
Solomon Grundy by Pr0ph3t November 19, 2003
1.)a sped
2.)everything and anything that is random
God,that was so grunda.
Hey,you grunda,get over here.
grunda by Paul C April 21, 2003