Ahh there you go, maybe hitchhiking culture was different down here. Although I don't think I've ever seen someone attempting to hitch-hike in my life tbh. Just not something people do anymore I guess. (Maybe it happens in more rural areas).

You're not wrong about your culture spreading though. Halloween wasn't even considered a thing when I was growing up. Now... depending on where you live you get kids attempting it. But it's still a minority. Many grumpy home-owners saying "this isn't America!" still exist.

'Dag' is certainly some aussie slang. Although I've never heard it used like that, I spose that might be its origin (sheep shearers are kind of a historical working class icon here). These days it's probably be more synonymous with "dork", or wearing some unfashionable clothing.