Green’s Dictionary of Slang

jim n.4

[abbr. Jim Crow and thus crow adj.]

(US Und.) something second-rate, worthless.

[US]Jackson & Hellyer Vocab. Criminal Sl.

In phrases

play jim (v.)

(US) to fool about.

[US]H. Gould Fort Apache, The Bronx 184: You open your mouth and they club you down. I mean these motherfuckers ain’t playin’ Jim.