What is Completely Fucking Batshit Loco?
1.
Past the point of insanity, past the point of rationality. Incorperates both the meanings
Jim: Yo dude, whats up?
John: Not much, dave's nailing hamsters to the wall in the kitchen
Jim: WTF?!? what for?
John: His girlfriend left him for his brother, He's gone completely fucking batshit loco
See