A popular term around Sydney and possibly some other NSW cities.
A hard cunt is basically a chav
but isn't English or British as most chavs are. Hard cunts are mostly Middle-Eastern (Assyrian
to be precise but there are also many that are Pacific Islanders). They carry the same traits as chavs, such as wearing a lot of sport clothing though never even breaking a sweat. They also start smoking and drinking at very young ages, also similar to a chav.
This term can also be used to describe someone who acts tough, but really isn't.