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In the late 19th century the words crack and jack were paired. Cracker was an adjective meaning an expert or superior that dates from the 18th century. Prior to that crack was a noun meaning something superior and a verb to boast. Jack has been used for man since the 1500's as a noun then as an adjective. The snack crackerjack popcorn dates from 1890. So, if put together crackerjack means an expert/superior man.
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JudyThe term "Cracker Jack" originated in the late 19th century in the United States. It was used to describe a type of snack made of caramel-coated popcorn and peanuts. The name "Cracker Jack" was trademarked in 1896 and later became associated with the popular brand of snack food that is still sold today.
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