A big bill such as a $20 or a $100 wrapped around a roll of $1 bills in order to make it look like more money than it actually is.
I owed Don Giovanni 15 G but didn't have time to come up with the money, so I tossed him a jewish bankroll wrapped up in a c-note and got the hell out of there before he knew what hit him.
A wallet with only single dollar bills and loose change inside.
"Your wallet resembles one of a jewish bankroll, so afraid to part with your big bills, only singles."
"Why are you picking up pennies, are you gonna add to your jewish bankroll?"