The Collaborative International Dictionary of English v.0.48:

hoagie \hoagie\, hoagy \hoagy\n.
   a large sandwich on a long crusty roll that is 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. S., such as hero,
   grinder, and submarine.

   Syn: bomber, grinder, hero, hero sandwich, hoagie, Cuban
        sandwich, Italian sandwich, poor boy, sub, submarine,
        submarine sandwich, torpedo, wedge, zep.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

hoagy
    n 1: 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,
         zep]