The title, "Rule 34", alludes to a generally accepted agreement on the internet, that if a thing or an idea exists, somewhere on the internet there is porn about it (often followed up with Rule 35, that if there isn't porn about it, there will be).
Vorarephilia (often shortened to vore) is a paraphilia characterized by the erotic desire to be consumed by, or to personally consume, another person or creature, or an erotic attraction to the process of eating in general practice.
Vorarephilia is the medical term for cannibalism.