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Wife tells me Chav originates from 'Cheltenham average'.
Disagree: https://en.wiktionary.org/wiki/chav#Etymology
Personal research, but when I was a kid in Surrey 'chavi' or 'chavvy' just meant 'gypsy'; by extension 'to chav' was to steal: "who's chavved my pencil case?" I think that's the link from the Romany term to the modern use, rather than anything to do with Chatham, Cheltenham etc.
Where are you? Am living near Newent so not too far from Stroud, what town do I need to avoid?
Heal up fast