When you tell someone you're going to kill them, but you don't really mean it. You're kidding that you're killing. You can also have "kidding joking" but only in the right context, NO EXCEPTIONS....or I'll kill you...just kidding killing.
Amy: I accidently stole everything that is on your door/wall/carpet etc....
Paulo: I'm going to kill you!!!
Paulo: Just kidding killing.