Uebermensch

The Übermensch — English: "overman" or "superman" ["transhuman" in my opinion is the best translation - PH] — is the philosophical concept expounded by philosopher Friedrich Nietzsche in the 1883 book Thus Spoke Zarathustra, whose eponymous protagonist contends that a man can become an Übermensch (homo superior; equivalent English: 'super-human'; see below) through the following steps:

1. By using his will to power destructively, in the rejection of, and rebellion against, societal ideals and moral codes.
2. By using his will to power creatively, in overcoming nihilism and re-evaluating old ideals or creating new ones.
3. By a continual process of self-overcoming.

http://en.wikipedia.org/wiki/Übermensch

The above may sound like onanistic philosophical bovine excrement or, if you have actually read Thus Spake Zarathustra, obscure mock-Biblical bovine excrement, so let me re-phrase it for you.

You reach 17 and you reject Christianity (or whatever).

You have overcome Christianity, the beliefs and values that society has foisted upon you.

There is then a void in your life. There is no philosophical foundation beneath your feet. What do you replace Christianity with? Nothing is worth anything, life is meaningless and not worth living, confusion, despair: in short, nihilism.

Eventually, if you don't kill yourself, you reach 22 and your feet begin to sense some solid ground again beneath them again. You overcome nihilism. You begin to construct your own philosophy, your own values, your own ethics. You begin to bestow meaning upon things, rather like Adam giving things names in the first week.

You have overcome nihilism.

Finally (and I am still going through this stage so forgive me if I have misinterpreted this part) there is still something to overcome: yourself. I'm not sure what this is. Probably your self-doubts, your uncertainties, the deformities of Christianity and your upbringing that you thought you'd straightened out but keep sneaking back, your forgetting of your goals, most of all your lazinesses. In short, this part of the process means becoming the master of yourself.