Mickey Finn is a drug that can make a person feel really sick or sleepy. It's not a nice thing to do to someone because it can be dangerous and even deadly. Usually, a person slips Mickey Finn into someone else's drink when they're not looking, kind of like a sneaky trick.
The drug itself is made up of different chemicals, which can cause different reactions in your body. Some people might feel really dizzy or confused, while others might feel really tired and sleepy. Some people might even blackout and not remember what happened.
It's important to remember that drugs can be really dangerous, especially if you don't know what's in them. You should always be careful about what you're drinking and always keep an eye on your drink.