When you bite into a freshly cooked, scalding, first slice of pizza to be removed from a pizza pie minutes after being cooked, then removed from a 500 degree oven. Generaly due to severe hunger. It was coined by the owner of Punk Rock Records who was laughing at a guido, on MTV's Jersey Shore.
Some jackass guido, on the MTV show, "Jersey Shore" filmed in Seaside Hights, NJ. In haste he bit into a freshly cooked, scalding, first slice of pizza. The cheese immediately stuck to the roof of his mouth. It's result was a second degree burn. It is ultimately known as a "New Jersey Sunburn"