Immature

Someone who maybe be irresponsible unorganized and does little kid things but all in all is a fun person!
A: MUD FIGHT!!
B: Your so immature.
by ieezsooperawzumninja February 14, 2010
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Mature

A really boring person that only does things that are "age like"...
"hey wanna go do 101 things in walmart??"
" no that is sooo immature."
"watever. ur boring."
by ieezsooperawzumninja February 14, 2010
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