The porn video tag "ts-jerking" is a combination of two elements: "TS" stands for "Transsexual," referring to the involvement of a transgender performer, typically someone who was assigned male at birth but identifies and presents as a woman; and "Jerking" refers to the act of self-pleasuring or masturbation. In this context, the tag describes a porn video featuring a transsexual performer engaging in self-pleasuring or masturbation activity.