arvo/arvi- afternoon (Use: "See you this arvo for lunch!")
bottle-o- bottle shop, liquor store
cleanskin- usually an inexpensive bottle of wine without a label; can also refer to unbranded cattle
dead horse- ketchup
esky- Igloo cooler
fair dinkum- to proclaim a fact or truth in a statement in such a manner. (Use: "Fair dinkum, the flight from Australia to the US is a long one.")
hooroo- casual good-bye
it's gone walkabout- when something goes missing or can't be found. (Use: "I don't know where my sunnies are; they've gone walkabout.)
ripper- great, fantastic (Use: "That was a ripper party!")
she'll be right/she'll be apples- It'll turn out okay
squizz- to have a look (Use: "We went shopping and had a squizz around.")
strewth- exclamation, mild oath (Use: "Strewth! That Chris is a good bloke!")
stubby- a small bottle of beer
tall poppy syndrome- when some one gets "too big for their britches"
ute- pick-up truck, literally a shortening of "utility."
woop woop- made-up name for a small, unimportant town away in the middle of nowhere. (Use: "He lives way out in woop woop. I'm not driving that far!")
Now that you have all of this down pat, understand that there are so many more idioms and words that we've hardly scratched the surface. If someone says to you, "grab your esky and thongs, hop in the ute because we're going to the beach for a barbie", now you won't look like a stunned mullet.