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Insert two or more fingers into the crotch area of your (possibly male) girlfriend to confirm her gender. Feel for testicles and/or a penis.

ATTENTION: This is the only 100% accurate way to figure out the gender of your (possibly-male) girlfriend.
Bob: My girlfriend looks like a man.
Dylan: You should finger-out her gender.
Bob: That sounds like some risky business.
Dylan: You can say that again!
by Nicholas Zombie March 31, 2010
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