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1.
Made by hiding a $20 bill between your credit card and drivers license in order to conceal its delivery to a bribee.
usually used in hotels to bribe front desk clerks into answering favorably to the question "do you have any complimentary upgrades?"

Try this in Vegas, it works surprisingly often.

The Twenty Dollar Sandwich can also be used with other denominations such as $50
by danny the greek June 07, 2010