There are several synonyms for the phrase "takes a leak," which is a casual expression for the act of urinating. Some of the most common alternatives include "takes a piss," "goes to the bathroom," "relieves oneself," "uses the restroom," or "visits the john." These phrases are often used interchangeably and can vary in formality, depending on the context in which they are used. While some of these synonyms may be considered vulgar or impolite in certain situations, they are generally accepted in casual conversation among friends or in more informal settings.