Basically a bunch of gay artsy-fartsy (technical term) types got together and started labeling things postmodernist (and then shortened it to po-mo, not to be confused with homo). It allowed them to say that their terrible writing and artwork was actually something more intelligent than it actually was.

Today there is debate over whether or not the term actually exists…

Below is an interview with a postmodernist:
Q: Why are you postmodernist?
A: That wasn’t me. I am changed now. I have different views. It was another moment.
Q: You did write it. It has your name on it.
A: And what is a name? A collection of ink stains on processed tree bark?
Q: No, I think it’s a…
A: a (article) - Not any particular or certain one of a class or group. Dictionary.com.
Q: Pardon?
A: This interview is not about Nanny McPhee. It’s not about fire hydrants or scallion pancakes. This interview is over. Do you want to ask any questions? The interview has just begun.

Yep yep…That’s right, it’s crap is what it is…