Green’s Dictionary of Slang

smoky adj.2

(US) black; pertaining to black people or culture.

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[US]N. Algren Man with the Golden Arm 26: The spades are moving in it’s [i.e. the neighbourhood] gettin’ smokier every day.
[US]R. Price Blood Brothers 57: Ooh, baby, that fuckin’ smoky bitch.

SE in slang use

In compounds

Smoky City (n.) [the pollution of the steel-producing centre; there may also be a play on sense 1 (above)]

1. (US) Oakland, PA (a suburb of Pittsburgh).

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[US]Nat. Police Gaz. (NY) 10 Nov. 14/3: The ‘fancy’ at the ‘Smoky City’ are full of fight since John L. Sullivan [...] visted that locality. On Oct. 23 at Linden Grove, Oakland, PA [etc].

2. (US black) Pittsburgh, PA .

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[US]Nat. Police Gaz. (NY) 17 May 7/3: There is considerable talk of the Smoky City team being scooped in by Hoosierdom, which, being translated into pure United States, means that Indianapolis has baited its hook for the Pittsburg Club.
[US]Pittsburgh Courier (PA) 25 Nov. 7/1: After taking a gapper through your spiel in the Smoky City Fourth estate, I’m stached in my niche in this doss joint diggin’ the ether box.