What is Finger Rule?
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A rule for determining a woman's worth during a hookup. One finger is a gift from above, two fingers is a perfect fit, three or more and you've got a whore.
"The finger rule lets me know that this girl was a gift from above, I could barely fit one finger in there"
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From the 2004 movie, Mean Girls.
When Damian is passing out candy canes, he says, "Taylor Zimmermann, two for you. Glenn Coco? FO..