The coincidental slipping of roofies to both individuals at a two-person party, each planning to have their way with the other as soon as he/she looses consciousness.
Dean Carlisle: So, Franco? How you feelin'?
Franco Genovese: To tell you the truth, I'm pretty tired. That last drink really went to my head.
Dean Carlisle: zzzzzzzz
Franco Genovese: Shit! Mutual roofination!
Franco Genovese: zzzzzzzz