A creature who can be nice but every once in awhile use very VERY naughty words.... But they are most of the time beautiful and are upon the female species.
If you call women that they will reply with YOU JERK!
Emma, gremlins, woman, Jerk, sneevil
Something snide and evil, combined to make a sinister laugh or comment.
I'm so Sneevil! I stuck gum on Ms. Hyde's chair!