"Eight miles out, six feet down" smells like an urban legend to me. It's certainly not the origin or common usage of "86," but I'm willing to admit the *possibility* that some mobster used it that way. Does anyone have any real knowledge about this?
To be clear: I'm not asking if the supposed mob etymology is the origin of the term. I know it isn't. What I am asking is whether anyone knows if it's ever been used that way, *after* it became common slang in the "leave and don't come back" sense.