"stupid person," 1944, from Yiddish shmendrik, from the name of a character in an 1877 operetta ("Shmendrik, oder Di komishe Chaseneh") by Avrom Goldfaden (1840-1908), "Father of Yiddish Theater."
schlub
schm-
schmaltz
schmaltzy
schmear
schmendrick
Schmidt
schmoe
schmoo
schmooze
schmuck