The porn video tag "ftm-transman" refers to a trans man or female-to-male (FTM) individual participating in sexual content. This term is used to describe individuals who were assigned female at birth but identify as male and may be undergoing hormone replacement therapy, surgeries, or other gender transition processes. These videos typically feature FTM individuals engaging in sexual activities with other partners, often highlighting the specific characteristics and experiences of trans men within the context of adult content.