the aussie saying that i absolutely love the most is when people call eachother cunts. it can mean any variety of things depending on the context, but i just LOVE that the word doesn't always hold such a negative connotation.
i almost got my ass kicked when i came home from oz. i said "heya fucking cunt" to one of my gf's at my welcome home party. she literally wound up to punch me, but thankfully gave me time to explain.
I had an Aussie friend who was similarly very charming in his use of the word (Aussies seem to use it with affection and not venom--and usually for men, actually). An American co-worker got drunk at Happy Hour once and called me that, though, and I kicked him so hard in the shin under the table that he turned purple.
He agreed that it was fair. And I suppose I proved his point.