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Mickey Finn

"drink laced with chloral hydrate," by 1918. Mickey Finn was used from the 1880s as the name of the main character in a series of popular humorous Irish-American stories published by New York Sun staff writer Ernest Jarrold (1848-1912), who sometimes also used it as his pen-name. Perhaps there is a connection.

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Definitions of Mickey Finn from WordNet

Mickey Finn (n.)
slang term for knockout drops;
From wordnet.princeton.edu