In the early days of the Remington and Royal typewriters, when paper was expensive and the results messy, overtyping to block out errors (e.g.: old prices on the daily menu or items out of stock) was common. Repeated typing
of the the digits 86 over a word would cover almost any previously typed word. The X was also used, and when you either typed "X" or "86" over a word the resulting edit was always called an "86" and anything so blotted out was "86'd". That's the connection with Delmonico's, and other downtown NYC eateries where the menus were printed for the day or week and had to be "overtyped" to eliminate items off the menu.
The raw oysters were 86'd by the time we got seated for dinner.