n. [ Now usually spelled crackerjack. ] [ prob. from crack + jack, a man. ] 1. An individual of marked ability or excellence, esp. in some sport; as, he is a crackajack at tennis. [ Slang ] [ Webster 1913 Suppl. ] 2. A preparation of popped corn, candied and pressed into small cakes. [ U. S. ] [ Webster 1913 Suppl. +PJC ] |