Green’s Dictionary of Slang

a hooligan, a working-class youth devoted to petty criminality.

2004		chavscum.co.uk 🌐 Chavs, Neds, Townies, Kevs, [...] whatever you know them as, this site is about them, Britains peasant underclass that are taking over our towns and cities!
2007		Indep. 1 June 20: Other regional insults [...] include ‘kev’ – short for Kevin – around Birmingham.