The porn video tag "mancini" is referring to a specific performer or director named Mancini. Mancini, in the context of adult entertainment, typically refers to someone who has been involved with the creation of pornographic content either as an actor or a director. This person may have contributed to the production of videos in a particular style or genre, and thus "mancini" serves as a tag that can help viewers find similar content or recognize this individual's work.