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"
by HawaiianHigh July 25, 2008
Jon: Let's see if the 3 finger rule applies to Stacy.Can i finger you Stacy?
Stacy: Yes Jon.
Jon: Well meet me at my place around 9ish, you passed the 3 finger rule.
Stacy: Yes Jon.
Jon: Well meet me at my place around 9ish, you passed the 3 finger rule.
by Pat da Baker n' Ian May 06, 2009
The rule is a game, were you have to make an OK sign with your hands below the waist; If someone sees it then you can do one punch to them. If the person who sees it puts their finger in the hand and gets it out without being caught, they get to punch you 5 times.
billy used the finger rule on his friend, but his friend quickly put his finger inside. Billy got punched five times.
by ULTIMATERIZUUMANN January 22, 2018