The phrase "transman-fuck" refers to a pornographic video where the main focus is on a transgender man, specifically in a sexual context. A transgender man, also known as FTM (female-to-male), is an individual who was assigned female at birth but identifies and expresses a male gender identity. In this particular video, the scene likely involves a sexual act or interaction involving the transman character. This content is intended for adult viewers who are interested in and comfortable with transgender themes in their pornography.