The porn video tag "Zack Randall (gay)" refers to a specific gay male performer named Zack Randall. In this context, the term "gay" indicates the genre of pornography that features same-sex encounters between men. Zack Randall is an American adult film actor who has appeared in numerous gay male pornographic films and has gained popularity among fans for his performances. This tag would be used to describe content featuring Zack Randall and other performers engaging in sexual activities with each other as per the gay genre.