An act partaken by two males and one female; this includes one man receiving oral sex by the woman and the other man giving anal sex to the woman whilst both men attempt to rotate her in a clockwise/counter-clockwise motion, thus resembling a rotisserie chicken at your local Bar-B-Q Restaurant/PTA Meeting/etc.
Take the example of rotisserie style chicken, you have the body of the chicken with a pole going in both ends. Now once we apply this sexually, we have a girl who gives one guy oral while having sex with another. That is the rotisserie.