When used as a verb, eighty-six, eighty-sixed, 86, 86ed, or 86'd is American English slang for getting rid of something, ejecting someone, or refusing service.
According to Merriam-Webster's Dictionary, "86" is a slang term that is used in the American popular culture as a transitive verb to mean throw out or get rid of, particularly in the food service industry as a term to describe an item no longer available on the menu, or to refuse service to a customer. The Merriam Webster dictionary suggests the term may be associated with the word "nix" ("no" or a more general prohibition).
Several possible origins of the term 86 have been suggested, all dated before the 1950s.