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typically denoting younger girls who shop at stores like forever 21, and other stores commonly found at the mall, that are characterized by cheaply-made clothing of substandard quality, which is often intended for single usage, like a night out at a club

pronunciation: fur-ev-er-twen-tee-wunna-bee
"did you see Jennifer's dress? I bet she got it for $6. what a forever21nnabee"
by Frankie Fourfingerz May 31, 2009