Richard Glover has an excellent list on How To Tell If You're A True Orstrahyun.
Some highlights :
You think it's normal to have a leader called Kevin.
You've made a bong out of your garden hose rather than use it for something illegal such as watering the garden.
When you hear that an American "roots for his team" you wonder how often and with whom.
You pronounce Melbourne as "Mel-bin".
You pronounce Penrith as "Pen-riff".
You can translate: "Dazza and Shazza played Acca Dacca on the way to Maccas."
You believe it makes perfect sense for a nation to decorate its highways with large fibreglass bananas, prawns and sheep.
You're secretly proud of our killer wildlife.
Hamburger. Beetroot. Of course.
You know that certain words must, by law, be shouted out during any rendition of the Angels' song Am I Ever Gonna See Your Face Again.
You believe, as an article of faith, that the confectionary known as the Wagon Wheel has become smaller with every passing year.
You believe, as an article of faith, that every important discovery in the world was made by an Australian but then sold off to the Yanks for a pittance.
You believe that the more you shorten someone's name the more you like them.
You know what it's like to swallow a fly, on occasion via your nose.
You understand that "you" has a plural and that it's "youse".