Definition of a Chav?

[Super Ted]

How would you define a proper Chav? I seem to be using the term more and more these days at certain idiots on the roads, but is it being over used? Is it the obigatory 'Elizabeth Duke' jewelry, stereotypical Burberry and tasteless car mods still the barometer? It don't want to prejudice people unfairly, so what's your definition? Please help with this pressing matter.