This porn video tag describes a scene where two transsexual individuals, both with large breasts, engage in sexual activity. The "TS" abbreviation stands for Transsexual, indicating that both participants are transsexuals or individuals who have undergone hormone replacement therapy and possibly gender reassignment surgery to transition from one gender to another. The additional description of "big tits" signifies that these individuals have large breasts, which is a common interest among viewers of this content category.