Meaning

noun a large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the U

originUncertain. Often suggested to derive from hog, either in reference to Hog Island, a site of shipyards that employed Italian immigrants (who were supposedly called hoggies and who supposedly packed these sandwiches for lunch), or in reference to pork as an ingredient.

Etymology from Wiktionary, CC BY-SA 3.0