This porn video tag, "nasty-tranny," has two primary components: "nasty" and "tranny." In the context of adult content, "nasty" is often used to describe intense or extreme sexual acts. It can imply that the scene involves rough, dirty, or taboo sexual activities.
The term "tranny" is short for "transgender," referring to individuals who identify with a gender different from their assigned birth sex. In this context, it suggests that the video features a transgender performer engaging in explicit sexual acts. This tag might appeal to viewers interested in transgender content or those who find such acts exciting and extreme.