noun
a drink laced with a drug to make someone unconscious or incapacitated
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The suspect was accused of slipping a Mickey Finn into the victim's drink.
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I heard that bartender is known for serving Mickey Finns to rowdy customers.
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Watch out for that guy, he's been known to spike drinks with a Mickey Finn.
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The shady businessman tried to pull a Mickey Finn on his competitors by spreading false information.