TDDs (Two Disc douchebags) - your frat-tastic, shirtless variety.
Chuckers - Dudes that just keep throwing discs. Could be alone with you behind him the last 6 holes, doesn't matter. He just keeps chucking one disc after another and has to putt from every approach. These guys are often drunk/high and completely oblivious to the rest of the world.
Hacks - Dedicated disc golfers that look like serious players to the untrained eye but would be murdered by any actually good discers. I'm a hack as is most of DGCR.