A step above a scumbag: a person whom you once regarded highly but upon spending more time with them, you find that person demonstrates questionable habits, morals, or ethics.
I thought he was a great guy at first but he turned out to be a total scrumbag.
Slang derogatory term for MTG "Type 2" (Standard) tournament format. This tournament style is looked down upon because it requires players to continuously buy new cards, since after a few months cards become banned.
"Naah, I can't play my deck there, they only do scumbag."
or
"I have 2 decks, one for playing with friends, and one that I keep tweaking so I can play scumbag format."