"trash," 1915, from American Yiddish shlak, from German Schlacke "dregs, scum, dross" (see slag (n.)). Alternative etymology [OED] is from Yiddish shlogn "to strike" (cognate with German schlagen; see slay). Derived form schlockmeister "purveyor of cheap merchandise" is from 1965. Adjectival form schlocky is attested from 1968; schlock was used as an adjective from 1916.
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