Kids acting 16 and 17 nowadays show immaturity by acting like 12 year olds..
by capule August 24, 2007
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What people who post definitions to this site are best at.
Bob: Hey, did you see that definition on Urban Dictionary?
Frank: Yeah, it was immature at it's best. o_o
by TheOrlyGuyLol January 24, 2010
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The adjective boring people use to describe fun people.
JK: "Nip slip!"
Maren: "You're so immature"
JK: "You're so boring"
Maren: "I know"
by jmfk November 18, 2014
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Immature is a person, usually 8-15 year's old, (and mostly male) who think sexual and inappropriate things are funny.
This drives me totally crazy, when your the only kid of you age that is way more mature then everybody else areound you (like me)
They call everything they don't like gay, or retarded, and anybody smarter than them a nerd, because they are to incapable of realizing that they are stupid, and (not to be hypocritical) retarded...
-Immature person- You got high honor roll in school? Hahahha! Your such a gay nerd!

-Civilized person- Your immaturity is making yourself look bad...Not me
by TheJazzKidOfTheSchool666 June 23, 2009
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When someone doesn't look at another's point of view.
I think you should apologise to me (even though I've deeply hurt you).
by Peter Smith September 15, 2003
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People who are annoying, don't know what they are talking about, and sometimes bitch way to much.
Look up Nu-Metal and you'll find many examples of the bitching part of immaturity.
by Drummer November 11, 2004
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