The action of which a girl has sexual intercourse, doggy style, on one male, whilst sucking on anothers male's penis. The whole experience is pure 100% ecstacy for her, but somewhat homosexual for the two males.
DJ: Hey man, what did you do this weekend?
Derek: Ah man, me and Trent got really drunk at this party and pulled a suckfuck on this really drunk chick. She was a fox. And now I feel a little bit closer with Trent.