Barely Legal Barbie - a term used for underage girls who are generally immature and petty and that think they are hotter than they actually are. Also, used for said girls (generally 20 and under) who try to date older guys and generally piss the guy and his friends off. They are just like a Barbie too. After a while you get bored playing with them and the only thing to do is buy accessories cause they aren't good for anything else. Also can be used as Barely Legal Bitch.
Hey Joe, guess what i picked up at the store today, a blb. she even has her own car.
Cayla is such a BLB
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