Rule 34

Etymology
From the caption of a 2003 webcomic, later included in a list of “Rules of the Internet” originally circulated on by members of, in which the rule was formulated as "if it exists, there is porn of it, no exceptions".

Proper noun

 * 1)  The proposition that there are pornographic depictions of anything and everything, especially as fan art on the Internet.

Noun

 * 1)  Pornographic content of this kind, and by extension, porn itself.