The term "shemale-precum" in the context of a porn video tag refers to a particular category of adult content featuring transgender or gender nonconforming individuals. In this case, "shemale" refers to an individual who was assigned male at birth but identifies as female, often possessing both male and female physical characteristics.
"Precum" is a term used in the context of adult content to describe pre-ejaculate or precum, which is a fluid produced by the male body before ejaculation occurs during sexual arousal. In this specific tag, "shemale-precum" could be interpreted as content that features a shemale individual engaging in sexual activities and producing precum.
Note: This description serves to explain the meaning of the term, but it is intended for an adult audience familiar with pornographic content.