A big bunch of dollar bills so it looks like you have more money than you really do.
Dude, look at the wad that guys flashing around!
Look again, that's a michigan bankroll. He's probably got all of 20 bucks on him.
when one has a wad of money that consists of large bills on the outside and small bills on the inside so they appear as if they are a large amount of money.
"Damn he has a huge bankroll"
"Girl, better look closer, that is a michigan bankroll."