knuckle rule

the rule which state that you are able to date someone 2 years older or younger (2 knuckles from the middle both ways) without consiquence

Dude1: yo last night i hooked up with this hot chick from collage
Dude2: u mean the blonde one? shes 2 years older then you!
Dude1: knuckle rule
Dude2:good point, nice job last night

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The Knuckles Rule

The unit of measurement to make your dick seem longer than it is. (use smaller knuckles for better results)

Silas: what's your dick length according to The Knuckles Rule?
Mark: I got a six knuckle dick
Silas: damn bro mine is eight
Mark: are you using your girlfriends knuckles or yours?