The religious belief which holds that all asses, butts, booty, and junk trunks of all shapes, colors, and sizes are equally sexually attractive. Strict assnostics will worship butts no matter what their age or condition, although many assnostics practice their religion on only a limited scale (e.g. they worship asses of any color, as long as they are young and small, etc.)
Joe: "Do you want to talk to the girl with the flat ass, the one with the large ass, or the one with the freckled ass in the bikini."
Paul: "Yes, because I am a strict Assnostic."