The act described involves a specific sexual act performed on a prone individual. The receiver is positioned face down, while the performer defecates on their back, then proceeds to engage in sexual intercourse.
The term is considered highly offensive due to its vulgar nature and potential for humiliation. Its origin is uncertain, but the geographically specific name may relate to the supposed prevalence or origin of the act in a particular city, although evidence to support this is lacking. It is important to acknowledge the demeaning connotation of this act and the harm caused by using such language.