This porn video tag, "tgirlsblack," is a combination of two words - "tgirl" and "black." It is a shorthand descriptor for adult content featuring transgender women (transwomen or transsexual women) with black ethnicity. The term "tgirl" stands for "trans girl" or "transgender girl," referring to individuals who were assigned male at birth but identify as female and may have undergone some form of gender transitioning. In this context, the word "black" signifies that these transgender women are of African, Afro-Caribbean, or another black ethnicity. This tag is used by adult content creators and viewers to easily find and categorize specific types of videos featuring such individuals.