This porn video tag is a combination of two terms: "TS" and "stroking". TS stands for "Transsexual," which refers to individuals who have undergone or are in the process of transitioning from one gender to another, often including hormone therapy and various surgical procedures. Stroking is an act of manually stimulating one's own genitals as a form of self-pleasure or sexual gratification.
In the context of this tag, it refers to a transsexual individual who is engaging in the act of stroking their genitals for sexual pleasure and gratification. The term "stroking" here specifically describes the physical act being performed by the individual, while "TS" identifies the person involved as transsexual.
It's essential to note that this tag may not be specific to English language contexts but is still understandable in its meaning for adult audiences who are familiar with porn video tags and transsexual individuals.