A term for a person (usually used for females only) who is one or all of the following:
A) Unreasonably violent.
B) Nice one minute, then suddenly lashes out in anger (though usually in a comic fashion).
C) Secretly mafia.
Example for A or B)
Person 1: (Is hit by person 2) Ow! You're such a josie, you know!
Person 2: (hits them again)
Example for C) Omg, have you heard? She's been a josie all along!