[nq:1]I came across the following in Devious Derivations: Popular Misconceptions and More Than 1,000 True Origins of Common Words and Phrases ... This is an etymological holy grail, albeit wrought not of gold or silver but of more humble porcelain. (end quote)[/nq] It's said to be from 'gardez l'eau' shouted while chucking the waste matter from upstairs tenement windows isn't it?
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