The word "86" is often used in informal language to signify the act of canceling, removing, or getting rid of something, especially in a restaurant or bar context, where an item on the menu is no longer available. It can also mean to stop someone from doing something or to reject a proposal.
The origin of the term "86" is a bit unclear, but it is believed to have originated in American diner culture in the mid-20th century. Various theories suggest it could stem from specific codes used in bars or restaurants, with different explanations for the numbers' significance.