What the high heck is Post Modernism?

I’ve noticed this term tossed around quite a bit, but I’ve never quite got it. I’ve seen it used to describe art, philosophy, I think political meanderings, and I think language deconstruction (which also confuses me)… :confused:

When did it start?

Is it a movement, per se?

If the beats has Ginsberg and Kerouak, post modernism has…?

What does it describe?

Hope this is the right forum…

http://boards.straightdope.com/sdmb/showthread.php?s=&threadid=125408

Please post to the other one. Oops.