Im Canadian but Im really close to a Brit. also the Urban Dictionary says this about em.

Picture this a young lad about 12 years of age and 4 ½ feet high baseball cap at ninety degrees in a imitation addidas tracksuit, with trouser legs tucked into his socks (of course, is definitely the height of fashion). This lad is strutting around, fabulous person in one hand jewellery al over the over, outside McDonalds acting as if he is 8 foot tall and built like a rugby player, when some poor unsuspecting adult (about 17/18) walks round the corner wanting to go to mcdonalds for his dinner glances at the young lad, the young lad jumps up in complete disgust and says “Whats your problem? Wanna make sommin of it? Bling Bling” when the adult starts to walk towards the young lad, the young lad ****es himself and runs off to either his pregnant 14-year-old girlfriend or his brother in the army crying his eyes out.

My mate has become a chav what can i do? answer is shoot him before it is too late