The porn video tag "boy feast (gay)" refers to a scene in which a group of young, usually attractive, men engage in sexual activities with each other. In this specific case, the term "gay" highlights that these are male-on-male encounters, as opposed to heterosexual or bisexual interactions. The word "feast" implies an abundance or variety of sexual acts and partners being enjoyed by the participants. Overall, the tag indicates a scene featuring multiple young men involved in a sexually charged and diverse experience with one another.