Mantarted
Not to be confused with boytarted. Is when a man acts like a fool for no apparent reason. Usually ruining their relationships, or definitely pissing his wife/girlfriend off enough to warrant him sleeping on the couch and or causing the relationship to end.
Why did you beat him up? Jeff is in my college studies class, that's the only way I know him. Don't be mantarted, I wouldn't cheat on you!