Something that makes life a lot more fun.
Though being completely immature will probably have adverse effects on your social life, education, and life in general it'll be more fun!
1. Zoe: Look John, I'm sorry, I'm breaking up with you.
John: Yeah? Well...you've got herpes!
Zoe: This is why I'm breaking up with you! You're so god damned immature!
John: At least I don't smell bad!
2. Bob: I'm sorry Karl...your...well...your dog died.
Karl: Oh...well...YOU LIKE MEN!!! MAAAN LOVVEEERR
Bob: Wow. Your immaturity was so bad I might have to jump out of a window.
an unwillingness to recognize, like those around you, that your head is up your rear end, and you like it there.
The Decline of our civilization...
Kids acting 16 and 17 nowadays show immaturity by acting like 12 year olds..
A made-up word that conceited tweens like to throw around at people who aren't conceited tweens.
Boy: Hey. so.. did you score with that guy last night?
Girl: You're so immature!!!!1
Boy: Fucking cunt.
When a person older than you acts liek a little kid and post retarted definitions on a website that don't make any sense ad recive little acclaim and noone likes the joke's other than other immatures people like them selves