"Hooning" is driving your car/bike really fast and revving the engine to make a lot of noise, usually very late at night, they often occur around burnouts, but not always. And a "bogan" is kind of the Australian version of...I guess "white trash" sort of people? People known for generally being drunk, violent, inconsiderate, and generally awful to others. There is also a classist aspect to it as well, as they tend to be poor, but I wasn't intended that aspect of it here, more the "loud and inconsiderate" part.