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.
See also: mickey, slip
Farlex Dictionary of Idioms.

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.
See also: mickey, slip
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • slip (one) a Mickey (Finn)
  • slip someone a Mickey
  • slip someone a Mickey Finn
  • drink (oneself) to sleep
  • drink (someone) under the table
  • drink somebody under the table
  • drink someone under the table
  • drink under the table
  • What are you drinking?
  • What are you having?