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1.
1) n. A person between the ages of 12-20.
2) a. To perform an act or to behave in a manner most commonly associated with teenagers.

Adding a definition to this site was a very teenage thing to do.

Getting a mohawk would be a very teenage thing to do.

Getting drunk off 6 cans of beer, crashing your car, then crying when the police suspend your licence would be a very teenage thing to do.
by Hieronymous Bosch May 21, 2006