Definition of whippersnapper noun from the Oxford Advanced Learner's Dictionary

 

whippersnapper

 noun
noun
BrE BrE//ˈwɪpəsnæpə(r)//
 
; NAmE NAmE//ˈwɪpərsnæpər//
 
(old-fashioned, informal)
 
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a young and unimportant person who behaves in a way that others think is too confident and rude Word Origin late 17th cent.: perhaps representing whipsnapper, expressing noise and unimportance.
See the Oxford Advanced American Dictionary entry: whippersnapper