Living this close to Philly, I think I'm finally getting educated in cheesesteak-ese. Though I've never had one, nor do I plan to have one, it's common knowledge out here that there's special etiquette when ordering cheesesteaks.
whiz wit = cheesesteak with onions, with cheez whiz
witout = no onions
Read more about this fascinating cultural icon here http://en.wikipedia.org/wiki/Cheesesteak