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eight·y-sixor 86 (ā′tē-sĭks′)
tr.v. eight·y-sixed, eight·y-six·ing, eight·y-six·es or 86ed or 86·ing or 86·es Slang
1. To refuse to serve (an unwelcome customer) at a bar or restaurant.
a. To throw out; eject.
b. To throw away; discard.
[Probably from waiters' and bartenders' slang of the 1920s and 1930s, originally used to indicate that an item on the menu was not available, perhaps rhyming slang for nix.]