The porn video tag "horny-transgender" refers to a specific type of adult content featuring transgender individuals. In this context, "horny" implies that the participants are sexually aroused and eager for sexual activity, while "transgender" denotes that at least one participant identifies with a gender different from the sex they were assigned at birth. This tag is used to categorize adult videos where transgender performers engage in various sexual acts with others, typically catering to the preferences of viewers who are specifically interested in such content.