I really love some of the nicknames Australians have for things. In particular I like the word "brekkie" in place of "breakfast".
I am sometimes weirded out that my husband comes home saying really Australian things to me like "no worries", "good on you", and "how are you going?". It just sounds very strange coming out of his mouth-- especially since he's speaking to me.
I also am a big fan of these straws you buy at the grocery store which have little beads of either chocolate, strawberry, caramel, or cookies and cream flavoring. You drink your milk through the straw and they flavor it, instead of adding syrup like we grew up with. Now personally, I'm not a milk drinker, but my kids really like them. As a bonus, they have only 1/2 a gram of sugar per straw, and no artificial flavorings or preservatives--which amazes me because I would have thought they were pure chemical joysticks o' flavor.