It is golf but with like frisbees as some people know them but they are actually discs. It is actually a professianal sport you can check out the website at www.pdga.com
Wow, I can't believe no one's responded. My friends and I have played quite a bit, though never at an official "course". It's more like pulling out all the 175g ultimate discs we can and picking a random target in the distance and throwing to it, then repeating when we get there. I've heard of many games going down on the campus of my alma mater in the middle of the night, with participants in varying states of stupor, but I was unfortunately not present at any of those. The most interesting game I can recall was on a playground in a rainstorm... too stupid to not be hilarious.
In short, this (can be) an awesome game, and people who aren't playing are missing out.
One of our university-owned lakes has an 18-hole course next to it. I've played there a couple times. I think I shot a 74 one time. It's like feel-good golf :). In actual golf I'd shoot more like 174.... I'd like disc golf better if it came with a disc golf cart equipped with a beer-holder~