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1.
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 Paul Schemier June 08, 2011
329 120
 
2.
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 ShelleyKnowsAll February 20, 2014
11 1
 
3.
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 mllelanoir August 30, 2007
62 83