Mother: eww! disgusting! im gonna call the cops!
Abo: no! i need it! i need to get high!
Mother: fuck off you filthy boong!
Contrary to what is already written, 'Boong' is derived from the word 'Boonga-boonga' which is actually an Eastern Australian Aboriginal word (Eora and Cadigal People for example) that means arse or bum and was originally used by the Aboriginal people as an insult to the colonisers.
Many Aborignal languages do not have swear words and, in Aboriginal Culture, the arse is the most disgusting part of the body. The Aborignal People would taunt the europeans and call them Boonga's (whilst flashing their black arses at them 'Braveheart ' movie style). Once the europeans realised what they were being called they turned it around and began using the word to describe Aboriginal People.
This is accurate information which was sourced from my personal lecture notes as well as papers studied at the Bankstown campus of the University of Western Sydney. Diploma in Indigenous Community Studies, Issues in Aboirignal Education, Native Title in Australia.
"These Gubba's are spreading disease all over the country, nothing but boonga-boonga's!"
That kid is legit "boong" right there.