I must say, this sort of concept isn't new. It appears frequently on a nihilistic idea of the world from the book "Beyond Good and Evil" by Friedrich Nietzsche, who has extended the notion of nihilism and inspired other existentialists authors.
So, what does beyond good and evil mean, as in, "both altogether". Nihilism is an empty, desperate and dark philosophy that renegades the truth itself in their surrounding. There is no deep, profound meaning in life, nothing is meant to be, all is just, nothing is higher nor deeper than something, everything is bland and nule down to justness. There is no knowledge nor wisdom, no purpose. So, Beyond Good and Evil; nihilism covers up that. It means, self-contradictorily, nothing. Morality is meaningless and thus should be eliminated. There is no such thing as morality nor critical actions, good and evil don't exist. In conclusion, the notion of Beyond Good and Evil was used in nihilism to describe how useless and purposeless critical-moral actions are; there is no judgment; there is nothing.
However, in reality, good and evil, and bad, are ancient words, they are words most twisted and modified words by us humans. They hold many meanings. Because of that, probabilities of finding a general definition of them are near zero, but that does not mean they cease to exist. Just because gay has many meanings around different places in the world does not affect its existence. Therefore, good, bad and evil are difficult concepts. Because of this, we are subjugated more to our opinions and ideals than facts and objective claims. We are beings with very limiting capabilities, we can't rely more on something, no matter how much we are attached to it. So, I may say, for example, there is this man and a boy, the boy is behaving in a way it throws everything he grabs to break it, whenever he approaches someone, he hits them, regardless of their identity, and the man, with serenity and patience, calls the boy's attention and scolds him. This is call, objective view, here, we are attached to factual views. Whenever, however, we are confronted by questions such as "How was the boy behaving", "How was the man behaving?", etc. Are questions in which, in respect to the situation, brings our own opinions. So answering them, majorly you would judge by stating the boy was bad, and the man was good. So bad here means a low degree of maliciousness, a mild action of wrong doing, normal flaws of morality.
Good is, fundamentally, quality in which morality is respected and followed. Now, if the boy were to take his actions to a severe, much severe case, bad would immediately go to evil. So, bad and evil are pretty much similar, but one is more severe and destructive than the other.
Now, assuming critical views, this is observation based on actions described relying on moral principles. A non-nihilistic definition of Beyond Good and Evil means exalting over observers critical view of your actions based on morality, but not necessarily discarding their existence. Buddhists, majorly (not to stereotype, other people from heterogeneous religions use this view), go beyond good and evil frequently in situations involving a cause-effect case of one's actions, or seeing through it.
So. Going back to the same example, one can infer that the reason the boy was "bad" could be he lost someone he loved, or a something dear to him, in which he was a good boy. But embraced by his own hatred and anger, he, in the name of love (something good), acts badly, and exalting above other observers who consider them bad. And the good man could have been the worst person ever, and to repent and forgive his sins, he decides to take this good act.
So, what may I finally conclude here? That the meaning of beyond good and evil just has the same problem that what does good, bad and evil mean at all. One can define Beyond Good and Evil from a transcendental point of view, or from a nihilistic view. Either way, these concepts are and have always and will always be part of our critical observation. All our actions are relative under one absolution: we, in a determined moment of time in our lives, change our way of observing, we are never stuck in one way, there is always something to criticize after or before observing neutrally.
Speaking of neutral, people can never posses an absolute neutrality. Neutrality is sticking to your own ways, even so, one can be an extremely good person and does not participate in communities or group that share common ideals. I personally consider neutral and positive very similar often.