Chinotto is a popular Italian soft drink, sold under several brand names. It was developed in the 1930's from a sour member of the citrus family.
However, lately among young men in Milano it has taken on the meaning of blow job
Spike: hey man I was out drinking in navigilo last night & ended up getting a chinotto from two chicks by the canal!
Fabio: No! local girls?
Spike: Are you kidding? couple of Germans on holiday.