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Definition of Na-na na-na boo-boo
1. Phrase. (North America idiomatic colloquial childish pejorative taunt often humorous) (defdate c. mid 20th century?) A taunt or putdown, typically used to indicate that the speaker believes he or she has beaten the listener in a competition or is better in some other way or in a general sense; or an expression of satisfaction that the listener has received some supposedly deserved minor punishment or misfortune (a schadenfreude). ¹
¹ Source: wiktionary.com