Urinal deodorizer blocks are the small disinfectant blocks found in urinals . There are many other words for them , such as : `` piss biscuit '' , `` urinal cake '' , `` urinal mint '' , or `` urinal puck '' . Urinal deodorizer blocks , also often called urinal cakes , urinal mints , or urinal pucks , are the small disinfectant blocks found in urinals .