A citizen who was born in or lives in the Australian town of Cessnock. They wear cheap plastic thongs, footy shorts and walk around proclaiming about how great there local football team "The Goannas" are.
Person 1: Hey look at that gronk!
Person 2: Yeah hes from Cessnock, go easy on him mate.
Hey you Cesnnock Gronk, get a job ya dole bludger!