The tag "gay pussy (gay)" refers to a porn video involving homosexual acts between men, specifically focusing on the male genitalia and sexual activities that involve penetrating or stimulating the anus. This tag is meant for adult audiences who are familiar with gay pornography and the specific terms used within this genre. Gay pornography typically involves two or more men engaging in various sex acts, such as oral sex, mutual masturbation, rimming (oral contact with another person's anus), and anal intercourse.
In this tag, "gay" is used to identify the specific category of content - homosexual acts between men. "Pussy," in this context, is a slang term for the female genitalia but is being used colloquially to refer to the male anus due to its similar role and function during sexual activity.