The porn video tag "free-gay-video" indicates that the content is a free, gay-themed video. In this context, "free" means that there is no cost associated with viewing or downloading the video, and it is available for anyone to access without restrictions. "Gay" signifies that the content features male same-sex sexual activities or relationships, which can include various acts like kissing, oral sex, penetration, and more. This tag helps users identify and locate specific gay videos within a collection of adult content.