The William Wallace - a sexual maneuver based on the fact that during the 13th century, they didn't have running water to clean up. A man and a woman engage in anal intercourse at which after a length of time, the man pulls out, rolls the woman over, and inserts his penis into her vagina in order to clean the detritus off of his shaft. Once he feels it is sufficiently clean, he works up to ejaculation, at which point he yells out , "FREEDOM!".
I didn't want to get up and go to the bathroom to clean up, so I William Wallaced her.