“Brooklyn Zoo” is a single from the album Return to the 36 Chambers (1995) by hip-hop artist Ol’ Dirty Bastard (1968-2004)—the Brooklyn-born Russell Tyrone Jones. There is a Prospect Park Zoo in Brooklyn, but the title refers to the craziness of the borough.
 
The term “Brooklyn Zoo” has been used infrequently. A book was titled Brooklyn Zoo: The Education of a Psychotherapist (2012).
 
   
Wikipedia: Brooklyn Zoo
“Brooklyn Zoo” is the debut single of the American Hip-hop artist, Ol’ Dirty Bastard from the album, Return to the 36 Chambers. After the Wu-Tang Clan started releasing solo efforts, Ol’ Dirty Bastard was second behind Method Man to release a solo album with Return to the 36 Chambers. This is Ol’ Dirty Bastard’s 2nd highest charting single, behind Got Your Money.
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Released February 3, 1995
 
OCLC WorldCat record
Return to the 36 chambers : the dirty version
Author: Ol’Dirty Bastard
Publisher: S.l. : Elektra, 1995.
Edition/Format:   Music CD : CD audio : English
 
Urban Dictionary
Brooklyn Zoo
Album of Ol’ Dirty Bastard a short time before his death. Also used as a term of endearment/rememberance/love towards him.
Example:
R.I.P. Dirt
Brooklyn Zoo Forever
by Alan Harris Jan 20, 2006
 
OCLC WorldCat record
Brooklyn zoo : the education of a psychotherapist
Author: Darcy Lockman
Publisher: New York : Doubleday, ©2012.
Edition/Format:   eBook : Document : Biography : English : 1st ed
Summary:
A New York City clinical psychologist documents the story of her stressful but exciting education in the face of institutional dysfunction, supervisor sabotage, and her conflicted feelings about her profession.