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1.
Someone perceived as being of little value or worth, as evidenced by being ignored when others are getting attention. Usually used as a semi-rhetorical question. Origin probably in American Jewish humor of the early-to-mid 20th century.
"What am I, chopped liver?" "What do I look like, chopped liver?"
by Joel K. December 03, 2005
 
2.
(adjective) nobody, the person that the others ignore him and consider him nothing.
I feel chopped liver in dis fucking hood.
by Fangsta March 17, 2003