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What one redneck says to another when he wants his chair back.
Hey, you done sat immature and I be wanting it back.
by Chase1204 April 14, 2008
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2
Teenage guys who:

1. can't go a minute without making a sexual remark
2. call everything they don't like "gay"
3. openly insult everyone who has a different opinion than theirs, usually with a racial or gay slur
4. have a tendency of shouting words like "PENIS!" in public
5. lack the intelligence to make a formal argument, yet think they're so awesome because they know, as someone before me posted, 100 ways of saying the word "penis" or 100 different sex methods.
6. become alcoholics and do drugs just because "it's cool", without considering that these drugs will cut their life expectancy in half, as well as make them look like total idiots when they're high/drunk
7. call everyone with at least 1.1 times their intelligence a "nerd", because EVERYONE knows that society has deemed it "cool" to be dumb as a stick
8. are the kind that drop their pants on purpose in public, sexually harrass everything that moves, or violate other kinds of dress codes and behavior codes.
Most teenage guys are immature, and not just in real life, but on the internet as well. This site displays perfect examples of immaturity at its best.

And btw, I'm a guy too.
by SomeBadJoke December 31, 2006
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4
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.
by hofosho23 December 01, 2010
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5
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
by Hemesath May 13, 2010
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6
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!!!
by lklkj98k November 01, 2009
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A word utilized to describe someone who exibits the behavioral patterns of a child. Such people tend to be impulsive; an example of which, is a tendency to use unwanted physical contact on another person, or making statements in complete ignorace and crudeness. Immature people also tend to make narrow associations of certain actions with certain effects, such as the association of biking with falling off.
by Anonymous October 21, 2003
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