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1.
A prison slang term used by older jail inmates or prison convicts for jail or prison "inmate store or commissary" bought items such as: small cakes or pies, candy bars or sweet tooth items purchased by inmates.

zoo zoo's and wham wham's are individually packaged fruit filled pies, twinkies, cup cakes,pound cake, small pecan pies,and all candy bars, hard taffy, licorice and small packages of hard candy, all purchased from inmate store.
by papa ron October 31, 2006
 
2.
slang for snacks of any sort, in the big house
hey man ill toss yo salad for some zoo zoo's and wham whams
by bige5569 August 22, 2003