In Napoli people use to buy and eat food in the streets since the times of the Roman Empire. In Pompei and other Roman cities, people use to buy food in places called thermopolia (sing. thermopolium, lit. ‘place in which hot (food) is sold’).
Apparently the first Italian fast-food of the modern era was established in Napoli and was called “vaco ‘e press” (it: vado di fretta, ‘I’m in a hurry’) and was a friggitoria, a store specialized in deep fried food.
And in fact among typical Neapolitan street food fritto rules.
They basically fry everything, including, of course, pizza
and then Pastecrisciute, fried bread dough
Scagliozzi, deep fried polenta
Sciurilli, deep fried zucchini flowers
Crocchè, deep fried mashed potatoes filled with mozzarella
Forget your liver, and enjoy!
(See also “I miss Italian street food – 1 – 2″
“I miss arancini” https://misshome.wordpress.com/2013/09/16/77-i-miss-arancini/ )