Rule of Two 

While a one night stand makes her feel used, a second hookup validates her worth. Then bail.

Remember that slut from the bar? Yeah, I used the rule of two on her.

Rule of Two by Lionel Matson December 29, 2011

Rule 138

If it exists, the government can regulate it.

"Hey did you hear about that air tax?"
"Rule 138."

Rule 138 by zippitybop April 20, 2012

Rule 118 

A general rule of the internet stating that if there is not a fanfiction of it, it will be made.

Girl 1: "I love Black Butler"
Girl 2: "Rule 118"
Girl 1: "YAY!"

Rule 118 by Lelouch Vi Brittania June 30, 2014

rule 313 

If it moves it is a fetish

Guy 1: dude did you hear about that guy who has a fetish for putting shit in helium balloons.
Guy 2: wow rule 313 right there bro.

rule 313 by TFA_Shadowwalker_090 June 30, 2015

Rule 34-S 

A clarification of Rule 34:
"Rule 34 is absolute, but not absolutely specific."

(Several other people have mentioned this principle, but I felt it deserved its own sub-rule.)

In other words, is there porn of Disney characters? Ohhh, yes. Is there porn of characters from a particular Disney movie? Probably. Is there porn of this character from this movie performing this act with that character from that movie? Probably not - but you never know.

Me: "Has anyone done porn of Maximus and Sven getting it on?"
You: "No way - much too specific. Rule 34-S applies."
Me: "OMG, I just found some!"

Rule 34-S by Egtverchi August 8, 2016

Rule 2006 

THIS APPLIES TO NBA YOUNGBOY FANS:
Younboy fans without a shadow of a doubt have/are...

jerked off to NBA young boy
beat women and pets
pussys at home but act hard at school
bullied by younger brother

listen to only young boy

cried when he’s been arrested
beat their dick with sand paper
claimed he’s the best artist
move around really stiff
flex their bb guns

watch romantic comedies and cry at the end

Young boy: “I feel like I’m Gucci Mane in 2006”

Young boy fan: Rule 2006 is facts everyone is true

Rule 2006 by Dick Cheeze Demario September 30, 2020

Rule 84+ 

If it exists, it's on a TI-84+ calculator. If it's not converted to a TI-84+ calculator, it will be.

Hey dude, the R34 is sooo good!
Dude fuck off, I only watch Rule 84+! It's epic!

Rule 84+ by DanielGamer 9 January 13, 2021