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Define Twelvies Meaning

Twelvie
Twelvies are (usually) 11-13 year old kids who, essentially, think they're more important/grown up than they really are, when actually these attempts at being more 'cool' and 'mature' just make them look less mature to those who actually are. They're quite naive and act like they know everything, when in fact, they don't. They often overuse stupid words such as 'swag'.

Twelvie: Look at me, I've got a boyfriend, I'm practically an adult now. Swag.
By Blakelee
Twelvies
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.

Twelvies:*wearing USA crop top, galaxy leggings and red vans* *goes to party* *smokes weed and drinks alcohol and thinks their cool but there parents don't know*

Person 1: oh did you see *name* at the party on Saturday smoking weed and drinking?
Person 2: yeah that fucking twelvie, she thinks she's
Cool smoking weed and drinking when she's 12. The only thing they should be drinking is milk and smoking those smoke lollies. Twelvie.
By Page
Twelvie
A person that is of the age 12. They think they're top sh*t. They think they own the place. They think they can win fights. They think they can do whatever they want. They act like there 16.

Wow that kid is such a twelvie.
By Zorah
Twelvie
Twelvie: Another word for a person between 12-15 years of age who is either a massive ganga/slut or who is a scooter fag who thinks they are cool by rollin round in big groups of other twelvies. ( Wannabe bikies )

Kids who think they are tough rollin around with their friends on scooters.

Non-twelvies talking:

Dude1:That girl over there was tunin on Jackson the other day.
Dude2:She was grindin on me at Sensations....
Dude1: LAWL fuckin twelvie ganga.
By Stevana
Twelvie
Someone who does Music.ly, or someone who is just too cringe to handle

Jason is such a twelvie, just look at his music.lys
By Faith
Twelvy
a twelve year old who act older then there age

look at those twelvy dressed like sluts
By Storm
Twelvie
A word used to describe any teenagers between the ages of 12-18.

Anyone who is under the (Australian) legal age.

Person 1: I can't tell how old these girls are with all their makeup.
Person 2: Oh, she's a twelvie trying to get in a club.

Person 1: So many twelvies around.
Person 2: It is school holidays.
By Koren
Twelvie
a person of the opposite sex who is noticeably younger than yourself, often caught checking you out. Usually they appear to be twelve years old, hence the term twelvie.

That twelvie over there was totally checking you out. You're old enough to be his aunt or something.
By Guinna
Twelvie
A twelvie is a 12yo girl or boy that acts way older than they actually are, and acts ridiculously annoying. They also try to be cool, but epicly fail.

*12yo buys car*
"Such a twelvie.."
By Konstance
Twelvie
A kid ages 12-15 who acts and thinks they are older than they actually are.

A group of twelvies outside smoking.
By Lorne