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A folded over stack of cash consisting of a large number of $1 bills with a $20, $50 or $100 bill on the outside so the bearer appears to have a wad of large denomination bills.
I tried to pay for drinks out of my batchelor's bankroll, but the waitress cock blocked me by counting the singles when I gave them to her.

or

person 1: Dude, you shouldn't flash that much cash, man.

person 2: Don't worry, it's a batchelor's bankroll.
by Farquad Arnot December 06, 2009
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