The expression for variations of "who cares" would be "Sticazzi" (~= "these dicks") and is a particularly important expression in roman culture! "Not caring" is core to our being, in most bad and good ways :)
There's even a short story whose origin I can't recall:
When God finished making the world, God was looking at his creation and some people showed up:
- Lord, we'd like to ask for Power - Let it be granted - said the Lord, and those became the Kings and Queens and Emperors
Then some more people showed up:
- Lord, we'd like to ask for Power - The Powerful already have that - Well, we'd like to ask for the Wealth then - Let it be granted - said the Lord, and those became the rich people.
Then God saw the Romans walk by and yelled at them
- Hey folks, I'm sorry, there's neither Power nor Wealth left!
The romans looked at each other in confusion, and replied "sticazzi?"
God thought about it a bit:
- Let it be granted!