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https://en.m.wikipedia.org/wiki/86_(term)

Eighty-six or 86 is American English slang used primarily in the hospitality industry and sometimes in the military.

In the hospitality industry, it is used to indicate that an item is no longer available, traditionally from a food or drinks establishment, or referring to a person or people who are not welcome on the premises. Its etymology is unknown, but the term seems to have been coined in the 1920s or 1930s.

Military personnel might use “86” informally to refer to scrapping equipment (e.g., “That old radio got 86’d”) or ending a plan or mission (e.g., “The op was 86’d due to bad weather”). It’s not an official term in military doctrine or manuals, but it’s part of the informal jargon that soldiers, sailors, or airmen might pick up and use, influenced by broader civilian language.