Translator note: Guro is a vague Japanese term about a specific fetish... damn, this is hard....let me give an example.

Someone cut a person in two and fuck one half while the person is still barely alive. There, classic guro and this is a tame example. I guess the English term would be "snuff porn"?

Usually is very graphic and realistic, like anatomy atlas realistic and with huge doses of sadism. I don't suggest anyone to google image the term. You have been warned.

p.s. Guro seems to be a bastardization of the term "grotesque". I am surprised the Japanese lacked a specific term for that on their language.