blue ice
 n.— «Stan Walchesky and neighbors on Neupert Road in Jefferson began noticing the stuff last week and speculated that it was “blue ice,” the euphemism for the chemically treated lavatory waste that sometimes falls from airplanes.» —“At least Prince isn’t a suspect” by Brand Keat Pittsburgh Tribune-Review (Pa.) Dec. 23, 2005. (source: Double-Tongued Dictionary)

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