(source: Iceberg Slim Pimp, The story of my life)
The section that contains the expression:
Flip out of wheels as much as possible. Flip em fast and crack more scratch for over time. Your name is Mary Jones. I got enough B. R. to raise you fast. You are not a thief. I dont need a bondsman or a lip now. You dont have a sheet.
(quotation marks as in original)
Slim gives instruction to his girl before he lets her out to the street to work as a prostitute. He teaches her even what to do if she would get arrested.
So, what does B.R. mean here?
"Your name is Mary Jones. I got enough B.R. to raise you fast. You are not a thief. I dont need a bondsman or a lip now. You dont have a sheet.
Here's my best guess.
"If you're caught by the cops you give your name as Mary Jones. I've got enough money put aside to pay what's needed to get you out quickly. You haven't stolen anything. I don't need anyone to guarantee the bail money, or an attorney. You don't have a criminal record."
I'm suggesting that:
"B.R." might = bank roll (thefreedictionary.com: "Gamblers, such as poker players, often refer to the money they have set aside to play as their "bank roll".)
"raise you fast" = get you out of the lock-up quickly (by paying bail or perhaps a bribe).
"a bondsman" = someone who would guarantee the bail money.
"a lip" = an attorney (thesaurus.com)
"a sheet" = a criminal record.