1. A person, usually a female, who seems very innocent and kind but really acts insane or psychotic.
2. Someone, normally female, who acts innocent and kind but is really rude and aggressive.
Bartholomew: "Hey, how was the date with Jessica?"
Jim: "It was horrible! I thought she was kind but she was really a psycho angel!"
Bartholomew: "Oh, how?"
Jim: "She was rambling on about conspiracy theories and would insult me if I disagreed!"