Kosher foods. Including but not limited to: gefilte fish, matzos, latkes, brisket, etc.. EXCLUDING cheeseburgers, bacon, and delicious marine delicacies such as shrimp, scallops, crab, and lobster. Pretty much any food that doesn't contain pork, mix milk and meat, or come from an animal with a shell. Named so because they are the fundamental nom noms of orthodox and hasidic jews (zids).
Every time I ate dinner at my ex boyfriend's house with his orthodox religious fanatic parents, they had zid munchies.
Now that New York Medical College has been taken over by the Touro College group, all they serve on campus are zid munchies. Boy vey, how the fuck can I get some zuppa di pesce.