⇨ shmo; schmo; schmolnoun a gullible, hapless fool. An American addition to Yiddish. In August 1948, just as 'shmo' was coming into the American lexicon, US cartoonist Al Capp introduced the 'shmoo' in the L'il Abner comic strip. The loveable and selfless 'shmoo' loved to be eaten and tasted like any food desired US, 1948