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chav comes from the dialect of the kent/romany travelling community, the travellers are known as "didikais" -

pronounced DI-DI-COYS.
the did's are know for lots of slang such as cushdy bok (a good thing), rozzers or cozzers (police), cosh (fighting stick), gavver (police). and of course chav (for a good child) so there you have it!

that tea is a teaving chavvy.

or hes/she's a real chavster
example should include the word "chav chavvy"
by jahur March 07, 2011