Pronounced "sue-POR", this means a diner or restaurant that cuts costs by serving soup OR salad rather than soup ASD salad with its dinner specials. Unfortunately not just a New York phenomenon anymore, as rising travel expenses and higher overhead force diners and restaurants nationally to cut back on the amount of food they serve.
If you're really hungry, don't go to a soupor. Look for a soupand! There are so many stingy resaurateurs these days!