"Schmack City" is a term, often used in the SF Bay Area as an adjective meant for describing food in a good way. "Schmack" or "Schmackin'" is a short form of it which just means delicious or amazing. The "City" part comes in to amount the level of "Schmack." So when it is being said with the city, it is saying that the food's deliciousness can compare to that of a city.
by Jholt April 30, 2014