Its when a person gay or straight engages in a threesome between two male twins taking a position of that of a chicken on a rotisserie. When done correctly the person is spun.
Joe or Joan is receiving anal while giving a blowjob to a set of male twins. He has gone for a ride on the "Twinotisserie"
in a homosexual relationship, there is almost always a "boy" and a "girl". The "boy" is simply the dominant of the two regardless of gender while the "girl" is the submissive. sometimes, there is neither a boy or a girl, and the two are as equals in dominance as identical twins would share equal behaviors recieved by the parents and actions towards each other. In short, a twinometric relationship, the partners are seen as equals instead of having a dominance complex.
Dan: "So, I heard you got yourself a boyfriend... who's on top?"
Tom: "We take turns each night, if you must know. It's a perfect twinometry.