"Urinal Spy" is a term used in the context of adult videos to describe a specific scenario or fetish. In this scenario, one person (or more) secretly observes another individual using a urinal. The observer often finds pleasure in spying on the target, possibly getting off from watching them relieve themselves. It's a form of exhibitionism for the person being watched and voyeurism for the person doing the spying. This tag is commonly used to categorize videos involving this type of scenario.