Take or have a leak

Vulgar slang for urinate dates from the mid-19th century but there is strong evidence that leak meaning to urinate was neither slang nor vulgar from as long ago as the late 1500s. Shakespeare used it a few years later in one his plays Henry IV Part I Act II, Scene I. “Why, they will allow us ne’er a jordan, and then we leak in your chimney.” (Jordan is an archaic word for a chamber pot, the origin of which is unknown according to the OED.)