Good morning I have a few Christmas related saying that are pretty Aussie here are some I have thought of.
Christmas Stocking- An inexpensive gift used to fill out a Christmas stocking
Done up like a Christmas Tree- Gaudily overdressed
Think you’re Christmas- To have a very high opinion of yourself
Rellies run- A trip to taken to see relatives as part of Christmas and New Year celebrations.
Don’t know if it’s Pitt Street or Christmas- To be stupid
Jo-AnneRamplings 
Dearest Jo-Anne,
Only the done up like a Christmas tree is a familiar saying!
Hugs,
Mariette
Well at least you knew one of them
😜