“Boh” literally has no meaning, but it is used with the meaning of “I don’t know”. When you say it, you have to shrug your shoulders and make a face. It’s the laziest word we have, but it couldn’t be clearer.
“Boh” can also convey the meaning of: “I don’t really care that I don’t know” or that it’s not that important to me.
Ex" Boh, non lo so! - Boh, I don’t know!
I’m wondering if in other languages you also have a word with the same meaning??