In the context of a porn video, the term "urinal" is used to describe a scene or act that involves one person urinating on another person, often as part of a BDSM (Bondage & Discipline, Dominance & Submission, Sadism & Masochism) scene. It typically involves the submissive partner being in a vulnerable position, such as bent over or tied up, while the dominant partner urinates on them. This act can be seen as an expression of dominance and humiliation for the submissive partner.