The porn video tag "bigdick-shemale" refers to a specific type of adult content featuring a performer with male secondary sexual characteristics (often referred to as a shemale) who possesses a large penis. This category is meant for adult audiences experienced with porn videos and may not be suitable for minors or sensitive viewers. It usually implies that the focus of the video is on the shemale character's big dick and their sexual encounters, typically with men or women. The term "shemale" is often considered outdated or insensitive by some, but it is still commonly used in this context for descriptive purposes.