What am I, chopped liver?

A semi-serious expression of frustration, anger, or indignation at having been overlooked and/or regarded as inferior. The phrase likely originated as a part of Jewish humor, referring to the serving of chopped liver as a common side dish (thus overlooked in favor of the main course), the taste of which many do not find appealing. A: "Mary is so smart, talented, and creative, I wish she were my best friend!" B: "And what am I then, chopped liver?" They said they wanted to hire someone else for the job. What am I, chopped liver?