Eroguro different anime.

The term itself is an example of wasei-eigo, a Japanese combination of English words or abbreviated words: ero from "ero(tic)", guro from "gro(tesque)", and nansensu from "nonsense". In actuality the "grotesqueness" implied in the term refers to things that are malformed, unnatural, or horrific. 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.