Green’s Dictionary of Slang

s.r. n.

[? abbrev. s.r.o. phr.2 (but chrono. is problematic)]

(US) used to qualify anything of the lowest, least appealing class.

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[US]H.M. Anderson Strip Tease 37: ‘Burlesque isn’t that bad. . . but it’s certainly the s.r. of show business’.