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.
Guy 2: That's too tween wave for me. I'm 21.
by weeping jag June 09, 2011