mother of Satan
n.— «The explosive believed to have been used by the bombers is triacetone triperoxide (TATP), also known as “Mother of Satan” because of its instability and lethality. It can be made from household items.» —“Australian bus terror victim dies” by Sasha Shtargot in London, England The Age (Sydney, Australia) July 16, 2005. (source: Double-Tongued Dictionary)
Further reading
What if, instead of being an inanimate object, a dictionary were alive? That’s the idea behind a lavishly illustrated new children’s book called The Dictionary Story (Bookshop|Amazon) by Oliver Jeffers and Sam Winston. This is part of a...
Aubrey in Waco, Texas, says her mother used to warn the kids against contracting honkus of the bonkus, a fanciful name for a contagious disease. This colloquial term probably comes from the words bonk and konk, meaning “to hit” or...