Based on the search results, it is unclear what "bad" refers to. The search results include information about a mobile game called "What in Hell is Bad?" which is an adult otome game where players can explore a secret club located in hell where the Seven Deadly Sins reside as VIP members. The game is also a defense-type game where players command the characters and place them on tiles to defend against angels. There are also reviews and updates related to the game. However, there is no information in the search results that explains what "bad" means outside of the context of the game.