This porn video tag can be broken down into a few words to understand its meaning:
1. Black: Refers to the race or ethnicity of the people involved in the porn scene, in this case, it signifies that one or more of the performers are black.
2. Shemale: This term is often used to describe a transgender woman with male-to-female characteristics who has not undergone surgical transitioning. In some cases, it can also refer to individuals with specific physical attributes like a larger than average penis.
3. Fuck: A slang term for engaging in sexual intercourse, specifically referring to the act of penetration.
So, the tag "black-shemale-fuck" implies that the porn video features a scene where a black shemale (transgender woman or individual with specific physical attributes) engages in sexual intercourse, typically including penetrative acts such as anal sex or vaginal sex. Note that this term may be considered offensive by some individuals and is not universally accepted as a descriptor