slip a Mickey
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
to secretly put a Mickey Finn in someone's alcoholic drink. (This drug either makes the victim ill or causes immediate diarrhea.) somebody slipped Barlowe a Mickey and sent him into action. For a ten-spot, the bartender slipped slim a Mickey.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.