Signabatikis
A person who gives backhanded compliments, tells possibly offensive jokes, or just straight up says terrible things without changing their tone of voice. Resulting in almost no one being able to tell whether or not the person is joking.
"Bro Marcus just told Eric that he hopes Eric will kill himself and that no one would miss him, in a serious tone mind you, and once he got sent to the principal's office, he said it was just a joke. What a fucking signabatikis." Leon said, while on the phone with his friends.