schmeckel, n. — Green’s Dictionary of Slang

schmeckel n.

[Yid. sl. schmeckel, a small penis; ult. Yid./Ger. schmecken, a taste, i.e. a small amount]

(US) a fool, a second-rater.

1997

E. Little Another Day in Paradise 36: ‘All your life ya been a schmeckel. Now it’s time to be a schlong, put on fine clothes, go nice place.’ [...] ‘Ya know the difference between a schmeckel and a schlong? [...] Well, pal, a schmeckel is about this long’ holding his fingers about an inch apart.