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1.
Like the Black Market, only all the illegal items you will ever need come from your fellow inmate's asshole. Hence, brown.
Guard Falzone: Listen, just tell us where you got the melon baller.

Prisoner: (sigh) Jerry's asshole.

Guard Falzone: You mean...?

Prisoner: Yup, The Brown Market.
by tedwilli9 August 24, 2008
 
2.
Anything you would get black market such as copyrighted material or illegal narcotics except from a Latino, hence BROWN market.
Steve: Where did you get that polo shirt at bro?

Bro: I got it real cheap from the Brown Market
by B-M-G09 August 05, 2009