chav
Chav (noun) means (informal) A young working-class person seen as loud, badly behaved and dressed in a certain flashy style, used as an insult.
Etymology
The origin is uncertain, but it is probably Angloromani. Compare Romani chavi (“male child”) or ćhavo, shavo (“female child”), chal (“boy”), and chavvy (“mate, friend”); compare also Swedish tjej. It is possibly cognate with Portuguese chavalo, Spanish chaval, German Chabo, Russian чувак (čuvak), and Hungarian csávó. See also charva. Derivations from council-housed and violent or Cheltenham average (and similar) are folk-etymological backronyms.