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Crackajack
Crackajack Crack"a*jack`, n.
1. An individual of marked ability or excellence, esp. in
some sport; as, he is a crackajack at tennis. [Slang]
2. A preparation of popped corn, candied and pressed into
small cakes. [U. S.]
Crackajack
Crackajack Crack"a*jack`, a.
Of marked ability or excellence. [Slang]
Meaning of Crackajack from wikipedia