A sex act consisting of a man (or a woman with a strap-on), the pilot, bent over backwards in a “wheel-pose” with an erection where a women (or man), the rotor, is on top being penetrated while doing a split. At this point, you would get the two (or more) members of this fucked-up orgy to grab a leg of the person on top and proceed to spin them around resembling a Palestinian helicopter. Adding more people to this past-time will increase torque and thus increase the angular velocity of the person on top.
Happy: “So my girlfriend does ballet and I think I’m going to ask her to be the rotor in my Palestinian Helicopter at the orgy later.”
Irina: “Cool, can I come and watch?”
Happy: “Yeah, we can def use more people to help with the spinning.”