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.
by weeping jag June 09, 2011
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The escalating sound produced by a large group of tweens. At first, the sound is a light chatter. Then it grows in intensity and the frequency changes to a squeal. Eventually the incoherent ramblings of these little pricks drowns out all ambient background sound until you get a massive migraine.
After my buddies and I walked out of the movie theater we noticed a large group of tweens waiting around for mommy and daddy to come in their BMWs & Lexus to pick them up. Their tween spastics were so deafening that we started to bleed from our ears.
by Cheesus Crust on a Cracker October 09, 2007
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Sometimes the hesi tween can complicate a friendship.

The hesiest of all tweens
by KruolLife May 26, 2020
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The section between a man's balls and asshole.
She was surprised at his reaction when she licked his 'tween meat.
by JDfool March 11, 2012
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A small child who when out on the town tries to sexually engage in many situations while heavily drinking and not doing chores. While in the process is heavily confused about the age of her prey and tends to creep on older men.
That creep ass tween can't control herself and wont leave me alone.
by dudepics123go December 14, 2012
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1) Anatomical region located at the junction of the left and right leg, generally associated with the location of male and/or female genitals.
Man, I should kick you in the tween-leg area for saying that to me.
by anon5552222 December 03, 2009
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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.
by The Jax April 25, 2007
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