In this porn video tag, "TS" stands for "Transsexual," referring to a person who has undergone or is in the process of transitioning from one sex to another. The phrase "sucks-dick" is a slang term describing a sexual act where one person performs oral stimulation on another person's penis.
So, this tag means that the video features a transsexual individual performing oral sex on a man's penis. This description is intended for adult audiences who are familiar with pornographic content and its terminology.