The porn video tag "gay public (gay)" refers to a genre of adult content where gay men engage in sexual activities in a public setting. This can include outdoor locations, parks, restrooms, or any other place where people might unexpectedly encounter them. In this context, the word "gay" serves as both an adjective describing the type of content and as a reference to the community involved. This genre often includes elements of exhibitionism, risk-taking, and spontaneity as the men engage in sexual acts in spaces where they could potentially be seen by others.