n.1. A dense mixture of cooked liver, hard-boiled eggs, chopped onions, chicken fat or vegetable oil, and seasonings, used as a spread or sandwich filling.
2. Slang Something or someone considered of little value: "a necklace and earrings that weren't chopped liver" (Paula Marantz Cohen).
[Sense 2, probably from the fact that chopped liver is often served as a side dish.]