whippersnapper[hwip′ər snap′ər, wip′-]
whippersnapper definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
an insignificant, esp. young, person who appears impertinent or presumptuous
Origin: extended ; from whip-snapper, one who snaps whips
whippersnapper definition by American Heritage Dictionary
A person regarded as insignificant and pretentious.
Origin: Alteration (influenced by whip) of dialectal snippersnapper.