I've heard about cupping. What is it? Is it smth made by coffee professioanls?

I think it's an art of tasting coffee or tea.

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Is it done professionallY?

Yes, it is usually done professionally. Experts in cupping are called cuppers. They can detect many nuances in flavours in coffee that many of us would miss.

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Cuppers do not just evaluate the taste of the coffee, but also the aroma, fragrance, and flavor of both green and roasted coffee beans. It is very interesting to see it done. Do a google search, if you are interested, and you will find video posts of cupping.