What is your favourite Australian Slang term? Or one you've always wondered about?

Have you got an Australian slang word or saying you love that you'd like to see go viral around the world?

Or have you heard Aussie slang that you wondered what on earth that was supposed to mean?

In the interests of furthering understanding and tolerance between nations, let's explain the hidden code of OZ. 

And, erm, just laugh at weird stuff. Lol.

Dirty Examples:

1) Americans use the word fanny, to describe butt in what is meant to be a kinda G rated way. To Aussies it means... well v-hole. "Fanny pack" consequently takes on a whole new meaning. As in where Wanda Sykes must keep the detatchable vaginas she describes in her shows.

2) Americans say root to mean cheer or support. To Australians it means to have sex. "We're rooting for you!" therefore brings a different visual to mind.

Some of these you may know. What are some more obscure ones? We need you guys to let us know what weirdness you've heard to help us out too.