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.
Sexual act involving two men and one woman. One guy in her mouth, one guy from behind. This makes the woman look like a rotisserie chicken. For even more fun, try rotating her while shes on each of your knobs.