Slang for urine, also used in many fetish websites, to denote the type of content, or on how extreme the content is. Usually this involves one urinating on another, or in some instances, drinking the urine.
Other slang terms associated with this fetish, are golden showers, water sports, and of course, piss play.
Sometimes it is associated with 'omorashi' though usually distinguished in western society separately.
Those who derive a sexual pleasure from the actual drinking of urine, is known as Urophagia.