Green’s Dictionary of Slang

in poor taste, vulgar, second-rate.

1968		Current Sl. II:4 8: Schlacky, adj. Out of place, unpleasant [...] — I just can’t study in this schlacky dorm.
1968		N.Y. Times 25 July 26: [His] career now seems to consist solely of playing the ‘special guest star’ in a series of schlocky European films.
1968		New Yorker 6 Apr. 162: If one examines books on modern movies, the stills generally look terrible—shlocky, dated, cluttered.
1975		A. Goldman Lenny Bruce 20: One day this schlocky show-biz attorney is sitting in his office.
1995		J. Stahl Permanent Midnight 88: I’d zipped back to Manhattan to cover some schlocky new comics.
2000		Indep. Rev. 21 Jan. 14: Raising your head above the parapet with anything other than [...] schlocky swingbeat is a challenge in itself.