Rule 34 

Generally accepted internet rule that states that pornography or sexually related material exists for any conceivable subject.

Additionally it is accepted that the rule itself has limitations and you cannot be too specific on the content of the item in question.

Most commonly used on various message boards for various reasons, from humor to cruelty.

I invoke rule 34 on the Rescue Rangers. What have I done.

Rule 34 by Nukeitall April 21, 2006

Rule 73 

If something naughty or unacceptable is said on a "safe" website and nobody understands it, you do NOT explain it.

Harry: "I know what Rule 34 is, and I don't think you should be mentioning it here."

Jinzo: "Rule 73. I think you just got me banned. Thanks for that."

Rule 73 by JINZONINGEN 73 April 4, 2009

Rule 666

If it exists, there is a wiki for it.

Person 1: Hey anyone know what World of Warcraft consists of?

Person 2: Check it's wiki

Person 1: There's a wiki for World of Warcraft?

Person 2: Dude your forgetting rule 666.

Person 1: Oh... Right...

Rule 666 by BloodAdept September 7, 2010

Rule 34 

If it exists, there is porn of it.

I posted a picture on /b/. I rule 34'd it. Dear God.

Rule 34 by Captain Jean Luc Picard October 29, 2006

Rule 88 

A rule of the internet that states "If it exists, there is a furry version of it."

I was looking at some FMA fanart and of course, Rule 88, there is a picture of Ed as a cat.

Rule 88 by AVeryBigBook February 29, 2008

Rule 12 

"Never date a co-worker." From the all-important (and sometimes hypocritical) rules of Leroy Jethro Gibbs of NCIS.

Ziva: "Tony, we cannot break Rule 12."
Tony: "Why not? Gibbs and Jenny totally did."

Rule 12 by dinozzosgirl February 7, 2010

Rule 40 

Pool's closed, due to AIDS.

Rule 36 states that "if it exists, it is someone's fetish", not Rule 40. Read the rules of the internet, newfag.

Rule 40 by loooooooooooooooooooongcat February 25, 2008