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9.
To be thirTEEN through nineTEEN years old. It is possible to be both a teen and an adult. Teen does not mean only a person who is not an adult yet.

A teen is someone who is constantly getting discriminated against, like blacks used to.

Unfortunately, the majority of adults fail to see that. (See bias or ignorant.)
My teen is so rebellious and has a mind of his own, which scares me, the parent! I want my teen to be a robot, not an individual!
by Jacob Wake-up May 07, 2009
 
1.
In online chatrooms it means a man in his 40's or 50's with his nob out.
In yahoo chat TEEN room - male, 42... male, 54...male, 49
by spunky March 20, 2004
 
2.
A group of people which keeps getting worse as generations go on. This generation's teens listen to pretty crappy music like 50 Cent and Good Charlotte. They also tend to have no minds of their own. They're getting fatter and fatter and fatter... Yeah, there are some decent teenagers... Not enough though.
Teen 1: I'M SO KeWl LoL i LiKe BoUgHt ThIs HoT tOpIc ShIrT wItH aN aNaRcHy SyMbOl On It 4 $20!!!!!!111!!!one!!!@@11! lOl

Teen 2: i m koolr cuz i gawt da new 50 cent cd w/ tha eXpLiCiT lyrics lol i can lissen 2 him rap a bout fuking grrls lololol he roxxors!

If you are a teenager reading this and haven't lost your mind yet, do anything you can to save yourself. God bless thee.
by Wandering Freak June 22, 2005
 
3.
When used by online pornographers, a person between the ages of 18 and 25 (approximately)
Youngest teens on the web! (all models 18 or over)
by Linton July 11, 2003
 
4.
Short for teen-ager, a "teen" is the term used to perpetuate the stereotype teen-ager who is rebelious, watches MTV, listens to pop, rap, country, rock, and/or punk rock, and looked down upon by the older and/or more mature community.
"Those stupid teens make us normal teen-agers look bad."
by this guy September 17, 2004
 
5.
Moving targets.
Teens are idiots. Too bad I'm one.
by imsoboredimdoingthis July 23, 2003
 
6.
someone between the ages of thirTEEN and nineTEEN (d'ohhhhhhhhhhhhhhhhhhh!)
"Twelve-year-olds are far too young for the teen scene, and don't trust anyone over 20"
by kofi May 19, 2003
 
7.
A group that consists of people between the ages of 13 and 19 that is criticized for not meeting the standards of the conservatives (old people).
hey old people! look at how you were criticized as a teen before you criticize the teens of today.

"the older you get, the more conservative you become"
by Faux-Vie July 10, 2008