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Definition of Cracker jack
1. Proper noun. (trademark) A boxed snack consisting of caramel-coated popcorn and peanuts, well known for including surprise toys of nominal value. ¹
2. Noun. (countable) One kernel of the Cracker Jack snack. ¹
3. Noun. (uncountable) A quantity of the snack. Usually Cracker Jacks. ¹
¹ Source: wiktionary.com