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.
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.
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.