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1.
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.
by Nukeitall March 30, 2006
 
2.
If it exists, there is porn of it.
I posted a picture on /b/. I rule 34'd it. Dear God.
by Captain Jean Luc Picard October 29, 2006
 
3.
Rule 34: If it exists, there is porn of it. No exceptions.
Can I get sum Rule 34 on Captain Planet?
by Ninja337 January 05, 2007
 
4.
If it exsists, there is a porn of it, if there isn't there will be, there is NO exception to this rule as of now.

You cannot be 100% specific about this rule.
I saw a rule 34 of Scooby Doo - Correct.
I saw a rule 34 of Micky Mouse and Optimus Prime - Wrong.
(Please note, since I have suggested the second example, it is now being worked on by Insane Japanese Hentai Anmiation Artists)
by Abokasee June 14, 2008
 
5.
If an object can be conjectured, there is porn made of it. If not, then porn will be made of it as soon as someone hears what you are looking for. (see rule 34-B)

Known exceptions are:
Rule 34 itself. You cannot rule 34, rule 34.
Also, abstract ideas may not be rule 34'd, it must be a concrete object or be representable as one.
I call rule 34 on existentialism *wtf*
by FluffyNevyn August 02, 2008
 
6.
"There is porn of it. No exceptions."
True for any movie, game, character, etc. that you can think of, and some you can't.
/r/ rule 34 for calvin and hobbes
by Staurn April 18, 2006
 
7.
Rule 34 is an internet rule that basically means if it exists, porn or anything connected to porn about it will exist
My childhood was smashed before my eyes when i saw spondebob rule 34'd. Why god, why?
by FatMan437 September 15, 2009