"Gay Daddy" is a term used in the adult industry to describe a specific type of pornographic content. In this context, "Daddy" typically refers to an older or more experienced partner within a same-sex relationship dynamic. This genre often involves intergenerational pairings where the younger participant looks up to and admires the older individual.
The term "gay" in "gay daddy" simply denotes that this content features male participants engaging in sexual activities with one another, as opposed to other possible adult content categories such as straight or lesbian.
In summary, a "Gay Daddy" porn video would showcase a more experienced, older man being involved sexually with a younger partner within a same-sex relationship dynamic.