(1) That portion of one's penis which is cut off during circumcision,a Yiddish term (an accent of the german language used by jewish people)
(2) german word for "adornment" or "jewelry"
(3) metaphorical meaning: a prick, an asshole, etc
(1) Throw that schmuck away!
(2) necklaces, pearls, bracelets, etc
(3) Robert Crumb calls a lot of people schmucks