What's the idiomatic meaning of "che cosa sei" in italian?
In what context is it used?I think it's used to express frustration at someone, like in the Italian version of the song "Parole parole," at the end.Is this correct?

Question

Answer

I wouldn't call that an "idiomatic meaning", it is just "what are you?"

Answer

It is a perfectly good Italian locution.
Poets use it as it has a deep meaning, that's all.

Answer

what the hell are you... :D

Answer

It's not used... In Italian there are some expressions called "poetic permits" (licenze poetiche). Such expressions make no specific sense and you are free to interpretate them. They somehow have a poetic sound, so you may find them only in poems or song lyrics, like in this case.

Evden çıkmadan dil öğrenme fırsatını kaçırmayın. Deneyimli dil eğitmenlerimizden oluşan seçkimize göz atın ve ilk dersinize şimdi kaydolun!