An Italian American who has two distinct personalities, usually one when they are sober and one when they are wasted out of their mind. The sober half of this person is generally shy and timid, while the drunk half goes hard as a mother fuc*er at everthing they do, which can include but not limited to, hitting on girls, consuming alcohol, acting like a stupid ass mother fuc*er and, just straight up winning.
Guy: "Dude this party's wack, I'm bailin"
Other Guy "Nahhh brahh some dude startin to act like a Vitanza, shits gunna be wild"
Girl: "Who's that guy over there?, I've never seen him before"
Other Girl: "That's you neighbor. The one you lived next to for seven years!"
Girl: "Are you serious, it's like he is some one completely different!"
Other Girl: "Yeahhh he's a real vitanza ;)"
Girl: "Ohhhhh in that case I'm gunna talk to him!"