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1.
A tall, built, and dirty individual who's bad personal traits far exceed the good.

A Imum's worst trait is thinking they are "entitled to something" often asking for several favors in a single day.

Don't expect anything in return from an Imum, they are very self centered and only care about themselves.

A Imum can also be used to describe someone with very poor personal hygiene skills.

A Imum will cause an argument at every opportunity and put other people down in a pathetic attempt to make himself/herself feel better.
Dude don't be such an Imum and ask someone else to pick up!

That person has such nasty splotchy white teeth, totally an Imum!
by Eric Khoeler February 22, 2010