A person with a) a mental disorder, b) a penchant for doing things of a dangerous or "mental" nature
Fucking fuck off or I'll fuck you up the fucking A-hole you motherfucking fucker - don't you fucking look at me like that you fucking fuckstick, you think I won't fucking kill you, you unclefucking butfucker. Fuck off. What are you? some kind of mentalist?