The porn video tag "ts-masturbate" is a combination of two parts:
1. "ts": This stands for "transsexual" or "TS," which refers to an individual who has undergone, or is in the process of undergoing, gender transition surgery. Typically, this term is used to describe individuals who were assigned male at birth but now identify and express themselves as women.
2. "masturbate": This is a term that describes when a person stimulates their own genitals for sexual pleasure. In the context of this porn video tag, it refers to transsexual individuals engaging in self-stimulation and self-pleasure.
So, the tag "ts-masturbate" means a transsexual individual (a person who was assigned male at birth but now identifies as a woman) engaged in the act of self-stimulation and self-pleasuring for sexual gratification.