Some interesting slang :
beyond the Black Stump - a long way away
Bondi cigar or brown-eyed mullet - a turd in the sea

Bush oyster - a nose booger
Crack a fat ( I'll let you look that one up yourself)

Dingo's breakfast - a yawn, a leak, and a good look around (i.e. no breakfast)
Dunny budgie - a blowfly
Aussie Salute - brushing flies away
Shark biscuit - somebody new to surfing

There are also many slang terms that parallel what we use in the U.S. and
here in Canada.