Wagging from school might be known at mitching here or playing truant in the UK. Young Jett would be known for his wagging.
A walkabout is a long, long treck in the bush. Doesn’t really crop up that often in Summer Bay.
Waltzing Matilda is probably the most famous australian song for us outsiders. I can’t say I have a clue what it’s about. Here’s Slim Dusty with his version of the classic tune.