Tweenglish: (n.) The language spoken by preadolescents (from 10 to 13 years of age), called tweens, and young teenagers, as in "I thought I was doing so well, speaking Tweenglish, until I said that something that I would ordinarily have called awesome was beast...and my son looked at me pityingly and said "Mom, no one says beast anymore...now we say it's nasty." I will never be able to keep up with this."