Our language you could say is a lazy way of saying something to people, but what it shows is the laid back and friendly type of people you are likely to find in Australia.
Here are some examples of Aussie Slang
Arvo.................Afternoon
Barbie.............. Barbecue
Bikkie.............. Biscuit Cookie
Chook..............Chicken
Dag................. Nerd
Dunny/Loo......Toilet
G'day...............Hello
Grog............... Alcohol
Jarmies........... Pajamas
Kip................. a short sleep
Macca's.......... McDonalds
Mozzie........... Mosquito
Oldies.............Parents
Peckish.......... Hungry
Roo................ Kangaroo
Snag.............. Sausage
Tellie............ TV
Ute................ Pickup
Yonks........... a long time ago
Also Australian’s at times put a load of words together to say one thing like
howyagoinmate how are you going friend
A great site to see more aussie slang Australian Slang - What does it all mean