I remember my grandmother saying sciò to keep away an animal that was getting too close to something or somebody, whatever it was a cat, a chicken, or a dog.
Can that exclamation be used also for a person? If the answer is positive, in which cases is that acceptable?
I've heard it used even for people, but only in familiar or informal contexts; typically it's used to shoo (!) away children or people engaging in child-like disturbing behavior.
Unless clearly joking (at least to some extent), I would say it's rude to use it with adult people who aren't intentionally bothering somebody: the "target" of the sciò is put at the same level of an annoying animal or child, and is told to shoo away without even bothering to give a reason for that.
