Definition of ning-nong noun from the Oxford Advanced Learner's Dictionary

 

ning-nong

 noun
noun
BrE BrE//ˈnɪŋ nɒŋ//
 
; NAmE NAmE//nɑːŋ//
 
(also nong)(Australian English, New Zealand English, informal)
 
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a stupid person Word Origin mid 19th cent.: of unknown origin.