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a Mickey Finn
A drug that is used to incapacitate someone or render them unconscious, most often put in someone's drink without them knowing. Please be careful—it's scarily easy for someone to slip you a Mickey Finn at big parties like that. The victim of the robbery stated that the suspect had put a Mickey Finn in his drink while they were at the bar.
slip (one) a Mickey (Finn)
To put a drug in someone's drink that will make them lose consciousness and incapacitate them; to serve someone a drink laced with such a drug. Please be careful—it's scarily easy for someone to slip you a Mickey at big parties like that. The victim of the robbery stated that the assailant had slipped him a Mickey Finn at the bar.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
slip someone a Mickey FinnINFORMAL
If someone slips someone else a Mickey Finn, they give them a drink containing a drug that makes them go to sleep. I went there once and was slipped a Mickey Finn.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012
slip someone a Mickey Finngive someone a drugged or otherwise adulterated drink.
Recorded from the 1920s, this expression is of unknown origin, but it is sometimes said to be the name of a notorious Chicago barkeeper ( c .1896–1906 ).
Farlex Partner Idioms Dictionary © Farlex 2017
finand finn (fɪn)
n. a five-dollar bill. (Germanic via Yiddish. As in German funf = five.) I gave the old guy a finn, and he nearly passed out.
1. n. a drink containing chloral hydrate; a drink containing a fast-acting laxative. He slipped her a Mickey Finn, but she switched glasses.
2. n. chloral hydrate as put in drinks to knock people out. There was a Mickey Finn in this drink, wasn’t there?
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.