Sited from the Broadway version of a Bronx Tale from the song entitled Hurt Someone. To give an Italian Style Hello is an act of violence against a rival or enemy. Specifically it referred to the act of throwing Molotov cocktails to torch an establishment.

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.