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immature 

98% of the people on Urban Dictionary
"GEORGE W. BUSH" - Wanker. (Definition by OMGWTFMAN346)
immature by UberMan5000 March 27, 2004

Immature 

An opinion. someone created it so others would act like them
Kid A: Dude i touched it and it got hard

Kid B: THATS WHAT SHE SAIDD!!!

Kid A: you're so immature

Kid B: F*ck you
Immature by Hemesath May 13, 2010

immature 

Doing whatever it takes to make you happy and for some people, at least they're being who they are and not the stereotype of who they're supposed to be. Your inner child. Most people believe that age defines who you are and if you don't "act your age", you're immature. "Mature" people seem to be very depressed and settle for everything even if they don't want it.
Stuck up bitch: Why is that girl coloring in a spongebob coloring book? She's so immature.

Other person: At least she's doing what makes her happy, bitch.
immature by hofosho23 December 2, 2010

Immature Autist Delusion 

When ignorant people delude themselves and think that all autists are immature mainly due to mental retardation. This is of course false as most autists have been proven to be highly intelligent and mild functioning and autism itself isn't a mental illness. It is more of a developmental disorder and the more emotionally immature autists would generally be referred to as the Spergs.
Too much people suffer from immature autist delusion. I can guarantee you right now that I may be autistic but I always strive to be highly mature.

immature 

An overused term used by hypocrite teenagers (as in, 99%) to describe anyone or any opinion that they dislike.
Twilight fan #1: OMG that guy totally said Twilight is the boringest story EVER!!!

Twilight fan #2: OMG, he's so immature!!!
immature by lklkj98k November 1, 2009

immature 

-People who insult everyone who has a different opinion than theirs, usually with a personal, racial, or gay slur.
-People who become alcoholics and/or do drugs just because “it’s cool.”
-People who tend to be impulsive; an example of which, is a tendency to use unwanted physical contact on another person, or making statements in complete ignorance.
-People who act like a bitch because someone doesn’t want to do something for them.
-People who only ever need you to use you.
-People who behave like hypocrites too often.
-People who constantly bitch about their life when they have it better than who they are bitching to, or for attention.
-People who talk shit because they’re insecure about themselves, then get upset when the person finds out.
-People who offensively use words that are not interchangeable because they are too ignorant to educate themselves.
Your little brother may be immature
immature by therealdeal,itsbacon October 9, 2011