Today is the 26th of January, it is Australia Day.
My question is about its nickname Down Under and derivatives.
Q. If you had to, what would you call the citizen of a country called “Down Under”?
What came to my mind were the following:
Downunderer (Down Underer)
Downunderian (Down Underian)
but I can't say which would sound more natural to a native English speaker.
Q. How likely are you to use "Down Under" in your everyday speech? Would saying it mean you're joking, or just not serious, or maybe mocking the country?