Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
It consists of a pizza, sliced in half, accompanied by a small portion of spaghetti with a tomato based sauce. Although both pizza and spaghetti are considered staples of Italian cuisine, combining them in one dish is completely unknown in Italy.
Other meanings
In some instances, especially in the United States, pizza-ghetti is a home-made spaghetti dish cooked with the basic ingredients of a pizza, such as tomato sauce, pepperoni, olives, and mushrooms, but without a pizza crust. The mixture may be cooked in a pot or baked in an oven.
Pizzaghetti is a chain of Italian restaurants in Plymouth, UK. These restaurants do not feature "pizza-ghetti" on their menu.
Pizzaghetti Factory is an Italian-style restaurant on Gibraltar.
See also
References
Pizzaghetti description on Practically Edible: Web Food Encyclopaedia
Pizza-ghetti: a staple item on fast-food menus in Montreal