Green’s Dictionary of Slang

(US black) a job, esp. one that may not be ideal but supports one’s living.

1949–51		in M. Daly Profile of Youth 235: A job is a ‘hang’.
1968		‘Sl. of Watts’ in Current Sl. III:2.
1971		H.E. Roberts Third Ear n.p.: hang n. a job.
1983		‘Black English’ in Reader’s Digest Success with Words 86/1: hang = ‘job, gig’.