Green’s Dictionary of Slang

(US) an intensifying adj., extreme, tremendous, great, obvious, simple.

1964		Realist 48-70 24/1: The bust-out junkie will say to his cellmate: "I am a heroin addict. I started smoking marijuana and then naturally I graduated to heroin.
1967		L. Bruce Essential Lenny Bruce 76: A bust-out thief, who had relatives who were thieves.
1979		E. Torres After Hours 59: The old bust-out Havana days.
1988		D. Woodrell Muscle for the Wing 75: Bell was the guard, only he was also a bust-out gambler.
1990		S. Morgan Homeboy 118: A bustout reproduction of the Venus de Milo.
1997		E. Little Another Day in Paradise 4: I’d have more for me and more for the borderline crazies, bust-out junkies, psychotic scooter trash [...] I ran with.