A
twelvie is a person that is between 12-14 who thinks they are cool and they fucking know everything, especially the girls who think they are hot shit and wear crop tops to the dairy. Twelvies usually think they are cool hooking up with people or going to parties. Twelvies are fucking annoying and they think they are better than everyone else. Twelvies are also known as
teenie boppers. Fucking teenie boppers.