Dob

It is quintessentially Australian to detest dobbing.

Time to stop protecting boozy mates, Sydney Morning Herald, 4 November 2004

In a nutshell, in Australian English:

dob - To tell on someone.

dobber - someone who dobs you in

dob-artist (children's word) - dobber

Australians do not like authority. Australian do not like dobbers.

Take a break from drinking like the author of this article did - Read why and how in his book Between Drinks: Escape the Routine, Take Control and Join the Clear Thinkers