Green’s Dictionary of Slang

p.g. phr.

[abbr. past gone]

(US black) of time, last, just happened, e.g. four o’clock p.g.

[US]L. Durst Jives of Dr. Hepcat (1989) 3: Then about four o’clock p.g. the kitties all cruise on back to their pads to cop a little nod.