A portmanteau of gamer and lame, to describe the sort of individual for whom gaming is not simply a hobby, but an unhealthy obsession. They are typically reclusive and possessing minimal social skills. They are also typically rather immature, and may base a good portion of their self-image on their performance in multiplayer games.
It's impossible for casual users to play Unreal Tournament on public servers any more because glamers have completely taken over.
It takes 200 hours to finish that RPG? Only a glamer has that much free time.