Definition of eighty-six in English:

eighty-six

(also 86)

verb

[with object]North American informal
  • 1Eject or bar (someone) from a restaurant, bar, etc.

    ‘they were accused of cheating, and eighty-sixed from their favourite casino’
  • 2Reject, discard, or cancel.

    ‘the passwords will be 86ed by next October’

Origin

1930s (as a noun, used in restaurants and bars to indicate that a menu item is unavailable or that a customer is not to be served): perhaps rhyming slang for nix.