The porn video tag "shemale-trans" refers to a specific type of adult content that features transgender individuals or those with both male and female characteristics. This category typically involves scenes where performers have male genitals as well as female breasts, creating a unique blend of male and female attributes. The term "shemale" is sometimes used interchangeably with "transsexual," though the tag's intent is to specify content that includes both physical attributes. It is intended for an adult audience familiar with porn video tags and their meanings.