The porn video tag "tall-tgirl" has the following meaning:
1. Tall: In this context, "tall" refers to the height of a transgender woman (TGirl) being above average in comparison to other TGirls. It implies that the person is taller than most individuals within the transgender female community. This could be an important aspect for those who are specifically seeking out taller trans women.
2. Tgirl: Tgirl, short for "trans girl," refers to a transgender woman. This term is generally used as a positive and empowering label by the transgender community, recognizing their gender identity as female. A Tgirl is an individual who was assigned male at birth but identifies and expresses herself as a woman.
So, the tag "tall-tgirl" means that the video features a taller than average transgender woman.