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A rule on the internet that states "If it exists, there is porn of it."
"Rule 34 ruined my childhood :("
"No, it made your childhood sexier."
Rule 34 by suburbandictionary August 29, 2013
/ryool-thər'-tee-fohr/ n., pl. Rules 34 - The 34th rule of the Internet, which states that any object, character, or media franchise imaginable has porn associated with it. The only exception to this rule is outlined in Rule 35.

v., p.t. Rule 34'd - To make an object, character, or media franchise comply with Rule 34.
Rule 34 even applies to Magnemite.

In 10 years, the younger fans of My Little Pony: Friendship is Magic will discover that their favorite characters have been Rule 34'd.
Rule 34 by PikalaxALT August 19, 2011
Bob: is there bird porn?
Steve: Apply rule 34
Bob: O GAWD
rule 34 by ducky1998 October 18, 2012
If it exists, there’s porn of it, no exceptions.

(35=If no porn found, it will be made)
Person : (Very innocent)
Some1 else: Rule 34
Some1 else: Rule 35
Person: (hopes and dreams are crushed) fuck
Rule 34 by RoyelPixel ._. October 16, 2018
An infamous internet rule that no one seems to accept. For anything on the internet that exists, someone, somewhere, somehow will find a way to sexualize that. It can go from video game characters to cartoon characters to animals to popular persons to non-human living things to non-living objects or things.
"Dude, they already made Rule 34 of Cuphead."
"Aw fuck."
Rule 34 by someotherkid2021 December 6, 2017
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