Top Definition
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.
by guyswholikeguyswholikeguys September 13, 2009

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