"Airmax" in the context of a porn video tag is likely referring to the popular shoe brand "Air Max" by Nike. It might be used as an unofficial tag to describe a scene featuring athletes or sports, often involving physical activity. This could mean a variety of things such as:
1. The performers are wearing Air Max shoes during their sexual activities.
2. The scene takes place in a sporty environment like a gym or track.
3. The performers are engaging in sports-related activities like running or playing basketball.
4. The scene features performers who are athletes, fitness trainers, or active individuals.
In general, the term "airmax" is used to bring a sense of athleticism and excitement into the video.