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A phrase referring to staying "loyal" to a girl you've been hooking up with on a consistent basis when in a social setting, such as a party, wedding reception, kegger, etc.
Mike "Dude, I heard Stacy telling her friend she wants to go home with you tonight."
Brandon "I can't man, I've been hooking up with Laura."
Mike "So what? You guys aren't dating."
Brandon "Yeah, but still. I gotta show vagina loyalty."
by Kannabanana May 11, 2011
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