An individual so devoid of intellectual capacity as to render their person, more specifically from the torso up, as nothing more than a decorative headpiece resting atop their buttocks. This is not to be confused with the verb "asshat", which is the physical act of cranial-rectal inversion.
St. Anselm: "God is a being than which no greater being can be conceived. If God does not exist in actuality, then he can be conceived to be greater than he is. Therefore, God exists.”