Green’s Dictionary of Slang

(US) a teenager.

1961		L. Block Diet of Treacle (2008) 109: At one point two teeners approached him, their eyes wary. He was on their turf.
1968		H. Ellison ‘The Hippie-Slayer’ in Deadly Streets (1983) 102: She was button-cute, the way all groupie teenies are cute.
1976		N.Y. Times 29 July 26: He’s the biggest thing for teenies since Bjorn Borg.
1975		Dly Courier (Connellsville, PA) 9 June 3/3: [headline] Teener Avoids Fine by Visting pig Stye.
1994		G. Indiana Rent Boy 49: A whole car full of jersey teens speeding home from their senior prom.
2000		T. Blacker Kill Your Darlings 247: They don’t give a fuck about the various wasted rastas and teenies in there.
2024		J. Meades Empty Wigs (t/s) 291: Jimmy was a little bit naughty selling on his teenies to support bands. But if there’s grass on the wicket - Game On!