It is called Ero Guro, but is often shortened to just Guro. It is a Japanese art form that focuses on the bizarre, gore, grotesque, and mutilation mixed with eroticism. In the
West, gory hentai is often referred to as Guro, especially if there is a heavily mutilated anime
girl covered in
blood, missing limbs (or other various body parts), or spilling organs. Often all three is present and the subject is deceased.
Items that are pornographic and bloody are not necessarily ero guro, and ero guro is not necessarily pornographic or bloody. The term is often used incorrectly by western audiences to
mean "gore"—depictions of horror,
blood, and guts.
"I walked in on my cousin jacking to a mutilated, dead anime
girl. There was
blood everywhere!"
"That sounds
like Guro dude."
"I seriously think I'm scarred now, it was terrifying."