A po' boy (also po-boy, po boy derived from the non-rhotic southern accents often heard in the region, or poor boy) is a sandwich originally from Louisiana. It almost always consists of meat, which is usually roast beef or some sort of fried seafood such as shrimp, crawfish, fish, oysters, or crab. The meat is served on New Orleans French bread, known for its crispy crust and fluffy center.

Source: Wikipedia