Animated Japanese pornography. Includes Japanese cartoon porn or graphic novels in the anime, manga, or doujinshi forms. Hentai can be described as amine with all female orifices occupied by large penises and sometimes by the tentacles of giant horny octapusses. Massive breasts that are unaffected by the forces of gravity are obligatory in henbtai. In Japanese, hentai means pervert or abnormal. See anime and tentacle sex.