This porn video tag describes a scene where a Black transsexual (TS) individual is having sex with a guy. The term "black" refers to the race or ethnicity of the TS person, while "ts" stands for transsexual. In this context, it means that the TS individual has undergone or is undergoing gender transitioning procedures, usually from male to female but not always.
The act of "fucks" indicates that in this scene, the Black TS person is penetrating the guy sexually, typically referring to penis-in-vagina or penis-in-anus intercourse, although it could also refer to other forms of penetration. It does not specify whether the TS individual is using a strap-on dildo or their own penis in the act.
Lastly, "guy" refers to the male partner who is receiving penetration from the Black TS individual. The term is gender neutral and could refer to a man of any age.
Overall, this tag indicates a sexual scenario where a transsexual person of black ethnicity engages in sexual activity with another man.