whippersnapper

[ hwip-er-snap-er, wip- ]
/ ˈʰwɪp ərˌsnæp ər, ˈwɪp- /

noun

an unimportant but offensively presumptuous person, especially a young one.

Origin of whippersnapper

1665–75; probably blend of earlier whipster and snippersnapper, similar in sense; see whip, snap, -er1
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British Dictionary definitions for whippersnapper

whippersnapper

/ (ˈwɪpəˌsnæpə) /

noun

an insignificant but pretentious or cheeky person, often a young oneAlso called: whipster

Word Origin for whippersnapper

C17: probably from whipsnapper a person who snaps whips, influenced by earlier snippersnapper, of obscure origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012