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1.
(adj.)

1. A term used to describe younger children by teenagers when their actual age is unknown

2. A term used for people who are much older but seem or act as if they are around the age of twelve.
Guy: Did you see my nephew recently? He's like, twelve now.
Girl: I thought he was fourteen!

Girl: Are you listening to Justin Bieber? He has some interesting music about real deep stuff like love and romance...
Guy: He can't know about love and romance, he's like, twelve!
by t-t-ten million fireflies April 23, 2010