Aussie slang is not what usually the word was oriiginally meant for example : someone tells you your gay it does not mean your sexual preference , it means your being stupid.
Yes I know new one on me too, usually this saying is by the teenages .
Australians are not all hyper sensitive about the coloured debate, so you may here australian indigenous telling coloured jokes, so please dont take offence .
You might have heard different ways of greeting people in Australia from watching "Crocodile Dundee" or from Steve Irwin, but it's simply not true! Most Australians like people to say "Hello". If you say "G'day mate" in a really horrific accent (think Meryl Streep's impersonation of Lindy Chamberlain) expect most locals to cringe and walk away from you. Similar phrases which will be met with the same response are "Throw another shrimp on the barbie" and "She'll be right mate". In Australia, as in most civilised countries, we speak our own language. We expect you to be able to at least greet us properly and we'll try to understand each other from theron in. Saying these things I have mentioned would be like going to Paris and saying "C'est la vie" or "Vive la France" over and over again...until some annoyed local tells you you're being a knob.
Anyone who's heading to Australia MUST try and learn some Aussie slang. :-D
It's pretty fun and it's no sweat. Believe me, what you think some of the words REALLY mean may not be what it really is! So, memorize some important phrases before you go, mate. Have fun!