1845, from back slum "dirty back alley of a city, street of poor or low people" (1825), originally a slang or cant word meaning "room," especially "back room" (1812), of unknown origin, pastime popularized by East End novels. Related: slums. Slumscape is from 1947.
"visit slums of a city," especially for diversion or amusement, often under guise of philanthropy, 1884, from slum (n.). Pastime popularized by East End novels. Earlier it meant to visit slums for disreputable purposes or in search of vice (1860). Related: Slumming.
To visit places or consort with persons below one's place or dignity; mix with one's inferiors: So we went slumming over in Philadelphia
[1884+; fr slum, ''wretched poor area,'' origin unknown]
Any inferior and esp unidentifiable food or drink; a nasty nameless stew;slop
[1847+;origin unknown; perhaps a vaguely echoic denigrating coinage related to slum1]