We already have one and it's perfect. Whenever you go into a new environment, especially for jobs, there are a bunch of HN'isms you can drop to recognize each other. Nobody asks each others handles, because they respect each others privacy, and you just know that the people you are dealing with have some of the same topics front of mind. I've never asked anyone their handle, and nobody has ever asked me mine, and that basic respect is what characterizes it to me. HN is forum where people have the incentive to write as their best selves, and the effect of that is the largest archive of human honesty in the history of the species.

Being meta about it presumes it's an object of criticism with an end instead of just an ongoing experience that exists for no other reason than because it's enjoyable.