chav

"Noun. A person, usually of poorly educated, working class origin, who dresses casually in designer sportswear and vulgar jewellery. Chavs are generally viewed as an ignorant under-class with a propensity for criminal or loutish behaviour. Usually derog. Orig. South-west. Popular from early 2000s"
- peevish.co.uk

Misterpolly's etymology below reeks of spuriosity. The best theory seems to be that it derives from the Romany word chavi, child.

There is actually a website about chav towns in England. It is exceedingly negative if not hateful.

Sartorially, they do deserve scorn.

A scornful expression coined for the lower classes by the ladies of Cheltenham Ladies' School in England. From CHeltenham AVerage.

We Scots tend to use the equivalent word "ned".

I am shocked that only you have added this word. this must be an american site. it would be rated no 1 on an british word website (if there were one).