"Undead" in the context of a porn video tag refers to content that involves supernatural beings or situations that are related to the concept of being dead but still alive, often associated with vampires, zombies, or other types of undead creatures. It may also encompass themes such as necrophilia or resurrection fantasies. This category can evoke a sense of danger, taboo, and excitement due to its foray into the realms of horror and the supernatural. As with any fetish, this tag indicates that viewers are seeking content centered around these themes, often involving role-playing, costumes, or special effects to enhance the experience.