An 'Erzmeister' is a master (hence Meister) at transferring score or rating in games, usually because it is the only way the Erzmeister in question can achieve anything in that game.
It also has to be remarked that the Erzmeister can and will deny his illegal and sad actions in public, but is likely to confess it to a few individuals, in private.
Because of his/her/its actions, an Erzmeister is often hated by legit players.
- Wow that guy has a rating of over 9000!
- Dude, he's an Erzmeister
- Oh, sad!