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.
Jake: Yo babe was it good last night?
Selina: Well, other then your tiny ass dick, and that suprise sneaky macgregor, it was great!