Screechy, 10-to-13-year-olds who think they are cool, but are largely immature and obnoxious. They wear tacky clothing a la walmart, hail from the suburbs, listen to trashy pop-music, and watch mainstream television (mainly Disney Channel and Teen Nick)
More advanced teenyboppers have fancy cellphones, carry cigarettes they stole from their mom -but never smoke them because they're pussies, and try to look cool by swearing in every sentence.
Generally try to act way cooler and older than they are, but don't realize that they are chubby little failures.
Teenyboppers most often grow up to be ugly, useless white-trash.
12-year-old: i love eminem so fucking much. did u get that shirt at ambercrombie? thats so cool we should like hang out
16-year-old: Friggin' teenybopper.