black water
n.— «A brave West Australian Government is considering asking its residents to at least think about drinking recycled sewage water. In Victoria, the Bracks Government has firmly ruled it out and the Liberals agree there is no need for a move to drink what is known as black water.» —“Recycled sewage water a political turn-off” by Ellen Whinnett Herald Sun (Australia) Jan. 5, 2007. (source: Double-Tongued Dictionary)