crackerjack, n. — Green’s Dictionary of Slang

crackerjack n.

[play on SE colloq. crackerjack, exceptional + ? ref. to crack n.⁷ + jack n.¹ (1)]

(drugs) a smoker of crack cocaine.

1990		S. Morgan Homeboy 18: Junkies [...] wished the crackerjacks continued success in filling headlines and prison cells.
2001		ONDCP Street Terms 7: Cracker jack — Crack smoker.