"dva-cosplay" is a porn video tag that refers to content featuring characters from the popular video game, Overwatch. The character D.Va is specifically cosplayed or dressed up as by one or more participants in the video. Cosplay (short for 'costume play') is when people dress up as fictional characters from various forms of media like comic books, movies, TV shows, and video games. In this context, "dva-cosplay" represents an adult film that incorporates elements of cosplay with a focus on the D.Va character from Overwatch.