whippersnapper
noun/ˈwɪpəsnæpə(r)/
/ˈwɪpərsnæpər/
(old-fashioned, informal)- a young and unimportant person who behaves in a way that others think is too confident and rudeWord Originlate 17th cent.: perhaps representing whipsnapper, expressing noise and unimportance.
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whippersnapper