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1. adjective Excellent; very fine or pleasing. Primarily heard in US. Wow, you've really created a jim-dandy story here! Action, romance, comedy—it's got it all! I'm sure the plan seemed jim-dandy at the time, but you nearly got yourselves killed!
2. noun That which is very fine, pleasing, or excellent. Often used in the phrase "a jim-dandy of a," which can be used sarcastically to imply the opposite. Primarily heard in US. A: "How was your trip to Florida?" B: "Oh boy, it was a jim-dandy! It seemed like everything we did was even better than the last!" The company appears to be gearing up for a jim-dandy of a legal battle over the issue. Sounds like it's going to be a jim-dandy of a party next weekend.
excellent. This is a jim-dandy knife. Where'd you get it? Tom: I'll meet you at six, OK? Charlie: That'll be jim-dandy.