tween adult 

Those persons between the age of 18 and 21. Legally, they don't exist, for they are neither a child, nor a fully matriculated adult. They can be drafted, they can go to jail as an adult, but they cannot check themselves into a hospital or drink alcohol.

Man, I hated being a tween and a teeny bopper, but now I am a tween adult and still can't do shit.

tween adult by Quido1 November 29, 2011

Tween Rock

Music for or by tweens.

Sonic Adventures 2 is full of tween rock.

Tween Rock by jarrgon October 6, 2008

Tween Wet White T-shirt Trick 

When an older perverted guy who knows better, runs into a girl between 9 and 12 in a bathing suit wearing a white t-shirt over it, and the guy has the disturbing urge to want to see the girls under developed, yet already growing breasts. The trick involves tricking the girl into taking her bathing suit top off with her shirt on, claiming she can not do it. Then when she does it, the guy squirts her t-shirt with water. Most of the time, the girl is gullible enough to think he is just playing around. Sometimes, the girl catches on and isn't very happy about it. In rare cases, the police are called and the guy has a lot of explaining to do.

I was on the beach with my 11 y/o nieces friend. She was wearing a white t-shirt over her bathing suit. I knew it was wrong but I had a water gun and I attempted the Tween Wet White T-shirt Trick. She caught on with what I was doing after the fact and she didn't appreciate it. Neither did her parents or my niece........ or the cop........ or the judge.

Tween Wet White T-shirt Trick by The Jax May 3, 2007

Tween Wave 

Simply: it's popular music from 2009 to 2012. Coined by the creators of South Park in the episode "You're getting old." They are not making fun of a specific band, artist, or anything like that (maybe dubstep would be the best genre to describe tween wave). People are over-thinking this making it seem like they are ripping on Justin Bieber or something, but its a simple definition idiots.

I was just listening to a radio station that plays the most popular new songs, and that tween wave music sounds like total shit!

Tween Wave by TheAmazingNEZ December 11, 2011

Tween Wave 

Parent's don't get it.

(from the south park episode where the kids think the parent's music sound literally like crap, and vice-versa)

Dude my mom won't let me listen to tween wave. She just doesn't get it.

Tween Wave by thepussymasher December 1, 2011

Tween Cheese

The Cheese you find in between your toes.

That tween cheese tastes good.

Tween Cheese by EliteFX May 30, 2018

Tween Wave 

A sudden (not very long lasting) phase or trend that kids from the ages about 10-14 are generally interested in. Tween Waves interest people who are in the stage when you are too old for toys but not quite mature for anything else.

Guy 1: Have you heard the new pop-band Fighting Daisies?

Guy 2: That's too tween wave for me. I'm 21.

Tween Wave by weeping jag December 3, 2011