If you’ve seen any film or television show set a restaurant, you have heard the number ’86’ thrown around like a verb by restaurant staff.
It has two meanings.
The first one is “We’re out of” as in “86 the meatloaf” means “We are out of the meatloaf.”
The second meaning is little more ephemeral. As in “That guy at table 12 is 86.” This means two things in itself– one, “that guy” is going to be ushered from the premises pronto, and the manager or owner wants the staff to get a good look at him, because an 86’d guest is usually not to be served in the future.
Restaurants are loathe to lose a customer, so generally the 86’d person would need to behave absolutely heinously to be 86’d.
There are several theories as to where the slang usage originated, but the one that makes the most sense to me is as a synonym for… dead. As the parameters for a grave are eight feet long and six feet deep. So the meatloaf is dead; it is 86. And when a customer behaves foully, they can become dead to the restaurant; just as if they were eight feet across and six feet deep.