The phrase "general mayhem" refers to a situation characterized by chaos, confusion, and disorder. It describes a state or a scenario where everything is in disarray and out of control. Full definition
As a general rule, their productivity is comprised of messing up the entire house, destroying the books on the bottom shelves, and causing general mayhem. (dirtyrottenparenting.com)
Personally, I like to be in the action, so using the shotgun for close quarters and assault for general mayhem suits me the best. (thatvideogameblog.com)
It was like listening to a radio play hearing everyone on stage describing the body parts, blood and general mayhem happening while everyone stood around scratching their heads. (thatvideogameblog.com)