As might be heard in the shopping market parking lot: 'Be careful with that trundler, you wouldn't want the bill from my panelbeater.' English interpretation: 'Be careful with that shopping cart, you wouldn't want the bill from by body shop.'
At the New World supermarket
Or, 'Can't find the short. Call the sparky.' (electrician)
Or, 'Thanks for your help.' Response: 'No worries.'
Washrooms or restrooms are simply toilets. 'Could you please tell me if you have a toilet in this restaurant?'
Barbecues are barbies, flip flops/thongs are jandals, grog is alcohol. And if you see BYO on a restaurant sign, this means that you can bring your own wine to drink with your meal! Something we can't do back home in Canada.
Kids may politely ask for a lolly which is a request for something sweet (i.e. lollipop, etc.)
If you're asked to 'bring a plate', don't bring an empty plate! This means to bring food to share.
And a contagious verbal mannerism is the response 'Yeah yeah yeah' in rapid fire. It's not considered rude, but an affirmation that you understand exactly what the other is saying.