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From The Collaborative International Dictionary of English v.0.48:
jimdandy \jimdandy\ n. 1. someone excellent of their kind; as, he's a jimdandy of a soldier. Syn: jimhickey, crackerjack. [WordNet 1.5] 2. something excellent of its kind; as, the bike was a jimdandy. Syn: jimhickey, crackerjack. [WordNet 1.5]