The porn video tag "lady-tranny" is a combination of two terms: "lady" and "tranny". In the context of adult content, it refers to a transgender woman who is typically feminine in appearance and may engage in sexual activities. This tag suggests that the video features a transgender woman (often referred to as a "shemale" or "ts-girl") being intimate with one or more partners. The term "tranny" is considered by some to be offensive, so it's essential to consider the preferences and sensitivities of viewers when using such language.