Ass may refer to:DonkeyAsinus subgenusFrom the above, slang for "stupid person"American English colloquialism for buttocks (and other derived meanings)Same as Arse (British spelling)Æsir, the Old Norse for "deity"Ass (album), by Badfinger ASS may stand for:ASS (car), a French car made from 1919 to 1920ASS (gene), a human gene that encodes for the enzyme argininosuccinate synthetaseActa Sanctae Sedis, a former Roman monthly publication and gazette of the Holy SeeAdvanced SubStation Alpha, a… (More on Ass)