A business strategy in which you neg a client by putting your nutsack on a table to increase your companies value or increase the value of your product.
To increase the market value of the product John was selling, he decided to do a double bank shotright in front of the customer.
Most commonly used in combination with the Battery Bank. However the Double Battery Bank includes an extra bill of higher denomination set aside for emergency funds that is stored between the phone and its cover.
Friend 1: "Damn, I only put $10 in my Battery Bank. I don't have enough cash to go with you guys."
Friend 2: "Don't forget about your Double Battery Bank! I just saw you put $20 behind your phone case yesterday!"