Idiots. Chavvers are the guys (or girls) that stand around on corners yelling abuse then, shat themselves when you stop and turn around. Most Chavvers listen to R 'n' B (very repetative music which is often about sex or drugs and doesn't make sense) and think that 50 cent is "hard" and Vauxhall Novas, Addidas, Cheap beer and tracksuits are "well phat"(means good in chav speak) All Chavvers will say they lost their vaginity at like 10 or 11 years old when actually they dont have genitalia, (I put it down to some sort of mis-breeding) and have only ever seen it in a porn vid on the internet or from staring at other people in the changing rooms or in the toilets. Bet you knew this corner! Chavvers can't spell if you ask them to spell their name, they'll write something like "xXx" or "Da Man".
When a group of chavvers start yelling abuse at you, turn round and walk towards them, if they have not run away by the time you get there go to the head chavver (easy to distinguish usually hides behind others when you approach) and say "Boo!" then they will run.