zep n : 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 United States [syn: {bomber}, {grinder}, {hero}, {hero sandwich}, {hoagie}, {hoagy}, {Cuban sandwich}, {Italian sandwich}, {poor boy}, {sub}, {submarine}, {submarine sandwich}, {torpedo}, {wedge}]