Analysis of information sources in references of the Wikipedia article "86 (term)" in English language version.
2 [1970s+] (US) to kill, to murder; to execute judicially.
Eighty-six. To murder someone or put an end to something, [...] The expression derives from the restaurant waiter slang term eighty-six, which, among other things, means to "deny an unwelcome customer service" or to "cancel an order" ("Eighty-six the eggs!"), [...]
Eighty-six to kill US, 1991