When a girl inserts a roll of quarters into a guys ass hole, then proceeds to
jerk him off while he is squatting and his penis is aimed towards a paper
cup (like the ones used to hold ice cream at the ice cream shop). When the guy cums into the cup, the pressure of the orgasm pushes the quarters out.
So just like the Olde
Time Ice Cream guys, you get a cup full of cream and change back!