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A discrete reference in the homosexual community for a homosexual ("common") male that is both a pitcher ("highest") and a catcher ("denominator").

Such terminology is necessary so that homosexual males can easily and discretely identify themselves to other homosexuals as a top, bottom, or both.
He identified himself as a Highest Common Denominator on his online dating profile to broaden the pool of potential homosexual partners.
by iamred December 07, 2009
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