Anyone 16 years or older that acts the same way as a twelve, like dresses slutty, pretends to do adult shit when she really doesn't do shit. Basically a twelvie that never got over themselves
Bro 1: Man she's soo hot, look at all of the shit she does! I wander what she's like in bed ;)
Bro 2: Bruh, she's just a superseded twelvie, she's an overgrown slutty twelve year old..
Bro 1: That's so shit man, hate them.
by LawdJeebus July 11, 2014
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Trust me, this comes from experience 😂. I get called it all the time because I’m a total twelvie. I wear makeup even to school, I’m always swearing and screaming and I am always wearing crop tops and chokers on weekends. It basically means someone who is 12 and acts older than they should.
Person 1: Look at Josie Folland, she’s wearing a million tonnes of makeup again.

Person 2: Ugh she’s such a twelvie
by aNoNyMoUS ;))) September 8, 2019
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a waste of precious white stuff that is aged 12, normally you can find them playing fortnite or in town swearing loudly and vaping because they think they're cool. Also known to shout "ESHAY BAAAAAA" on the streets
Tommy: ESHAY BAAAAA!
Jake: ESHAY BAAAAAA! FUCKN OATH BOYZZZ LETS PLAY SOME FORTNITE L8R
Some civilised 15 year old named Rob: Look at those ever so uncivilsed twelvies
by divoc91 April 27, 2021
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They typically play games in the back of the classroom and steal peoples stuff.
They put on Aussie accents and always say mate like and adult would. They always claim that others are twelvies when really they are. They are unfit and inactive. They also claim things that do not belong to them and think they are top notch and usually people are defensive when the other is winning an arguement. Typically call others twelvies.
“Mate, look at this motorbike game”
“You’re such a twelvie
by John1422 July 25, 2019
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They typically play games in the back of the classroom and steal peoples stuff.
They put on Aussie accents and always say mate like and adult would. They always claim that others are twelvies when really they are. They are unfit and inactive. They also claim things that do not belong to them and think they are top notch and usually people are defensive when the other is winning an arguement. Typically call others twelvies.
“He stole my water bottle, whatta twelvie
“You are so autistic”
by John1422 July 25, 2019
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A young human specimen 12 years of age but thinks they're older then they really are. oh and they are generally smart asses.
stfu you dumb ass twelvie, go and neck yourself.
by milk'N'clorox March 19, 2018
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