Crude joke or prank.
1) Pull out some dollar bills (any denomination) from your wallet.
2) Stick them one by one in your pants and rub your genitalia with it. (preferably after you have been doing some extraneous activity that causes the area to sweat)
3) go to a gas station to purchase an item with the "cock dollars"
4) After your purchase and the exchange of your "cock dollars", you have the satisfaction that the clerk has "your nut sackjuices" in his/her hands.
We used slightly moist cock dollars to purchase the munchies for us and the gas for the pinto-mobile.
That hern, the 300lbs. fat bitch on a motorized scooter wearing a tube top and boy shorts, at the (local big box value store), was stuffing her shopping cart with 10 packages of bacon next to the 2 liter bottles of diet soda.