1. n. nonsense; something trivial. (From the world-famous mouse character by the same name, owned by The Walt Disney Company.) This is just a lot of mickey mouse.
2. mod. trivial; time wasting; lousy. I want out of this mickey mouse place.
3. n. a police officer. (Streets.) Mickey mouse is hanging around asking about you.
4. n. a bit of blotter impregnated with LSD with a picture of The Walt Disney Company’s Mickey Mouse on it. (Drugs.) How much is the mickey mouse?