What does it mean? Nobody knows.
But you probably are asking the wrong questions. What, who, when are of limited value and the answers change constantly. Why. Now you are getting somewhere. Why is the realm of the mind and that is where things get interesting. If you know why then the other questions have proper context and you can derive actual meaning and utility from the answers.
So what am I talking about? (See how easy it is to make that mistake?) Obviously, nothing, because this is all pretentious philosophical nonsense. Let’s have a beer and listen to music.