a sexual manuver that requires a threesum with two males. While the first male and the woman are fucking in a posistion with the woman on top (i.e. cowgirl
, reverse missionary), the secong male sneaks up from behind, and proceend to analy penetrate the woman. Then, the first male would slap the woman in the face/breast (optional)
While this posistion can be preformed consensually, it is usually a suprise to the female.