The word "douche" is a slang term used to describe a person who is considered unpleasant, arrogant, or self-centered. It's not a kind way to refer to someone. Full definition
While most of the main characters friends seem like douche bags who should have died in a cheap horror movie but somehow survived, all of the island's inhabitants are well realized insane maniacs or people that are so out there that you can never even tell if they are crazy or not. (darkstation.com)