Excellent, first-rate, or remarkable; something or someone of outstanding quality or ability.
Variant of 'crackerjack' (from 'crack,' meaning 'excellent' in 19th-century slang, plus 'jack,' a general term for a person). The Cracker Jack snack brand (1896) popularized this spelling.
Cracker Jack candy's original name came directly from 'crackerjack' slang—the company's marketing was so successful that the snack brand name became more famous than the slang itself, reversing the usual direction of naming.
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