For those unfamiliar with Modern Australian English (MAE), the British loan word 'Cunt' provides at least two popular meanings. While one of these is offensive, the other's best equivalent would be that of Mate or Friend.
Example: 'Johnathon you top Cunt'. - 'Johnathon you are a top Mate'
But note, usage such as 'Johnathon is one of my Cunts' is not valid.
What is the origin of the usage of Cunt as reference to a Mate?