An absolute alpha male who most men strive to be like. Everything about him his perfect.
I want to be more like Billy Grundy.
by Pbateman00 January 7, 2022
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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."
by jencii May 4, 2020
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Hairy, squat, laconic Nemesis of Superman
"Grundy hate Superman. Grundy want smash Superman. Grundy want pants, too."
by Tim February 7, 2004
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A man who wants some pants.
"Solomon Grundy want pants, too"
by Pr0ph3t November 20, 2003
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a faggot at your school that always bullies you and thinks he is top shit
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An ugly looking bitch with a big nose
Hey dude did you just see that snoot grundy on the corner?
by Pussypopper62718 December 7, 2017
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