I've read a few stories now on the 'Straya coin. I thought it was a joke at first, but it seems legitimate....
Those not familiar with the term' Straya - it's a term of endearment or shortened version of Australia which closely resembles phonetically how many Australians pronounce their country's name.
The coin itself is has images of thongs (flip flops, not underwear) and beer cans representing 2 important components of Australian culture....
Here's the story from the Bendigo Advertiser: