From the classic game RuneScape. Meaning 'ultimate iron man' as someone who plays the game without trading with other players and no bank.
Hey sorry I can't trade I'm a uim btw
by September 14, 2020
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Unintended Inspirational Mooning. When a person accidentally shows nekkid butt to the delight of onlookers.
"Did you see the photos of Ricky Berens' split swimsuit at the World Swimming Championships in Rome? Talk about a great UIM!"
by Queen of all Good Things July 28, 2009
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A decent middle school where anything can happen. People crawling on the floor, disabled people running through the hall ways your mental capacity is the limit. 6th grade is filled with a bunch of insecure people who cry over anything, 7th grade is chill and 8th graders think they are gangster because they take the bx8 home. If you are a fan of rats, you will love this place. The building is home to a system of rat tunnels. Further more if you love fights this is your ticket. All you gotta do is dis mott hall and the entirety of mott hall will rip you apart to pieces once school ends. Pros: Meet new people and make new friends Cons: Mott Hall -Fellow Scholar
ms101: At least im not UIM
uim: At least im not Mott Hall
Mott Hall: wow
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Only the most pussy people go here Some of the most pussies that go there have to be named Chris or mike or angel or jayson or Daniel
Yo I heard UIM pussy. Yup it sure is
by Pu$$y12345 February 11, 2019
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