Usually used to describe depictions or actions that are overtly graphic in the representation of violence. Used in relation to media that offers a preponderance of violence over any other element in the narrative. The term is used equally in relation to sexual violence, often to imply a sublimated sexual motivation for the violence. The term is synonymous with the term Ultra-Violence, which arises from "A Clockwork Orange" by Anthony Burgess.
Perhaps the extreme hyper-violence reflects Spain's old scars re-imagined by a Mexican director Guillermo Del Toro, but it held me away from falling into the magic realism of the story.