This porn video tag describes a scene where a shemale (a person with male secondary sexual characteristics and typically female primary and secondary sex characteristics) is performing oral sex on a man's penis. In this context, "shemale" refers to a transgender woman or a person who identifies as neither strictly male nor female. The tag focuses on the specific act of the shemale character sucking the man's dick (penis).
Tag explanation:
Shemale - A person with male secondary sexual characteristics and typically female primary and secondary sex characteristics.
Sucking - Performing oral sex.
Dick - Penis.