C17: probably from whipsnapper a person who snaps whips, influenced by earlier snippersnapper, of obscure origin
whippersnapper for learners of EnglishPowered by COBUILD (hwɪpəʳsnæpəʳ)
Word forms: whippersnappers
If you refer to a young person as a whippersnapper, you disapprove of them because you think that they are behaving more confidently than they should. [informal, old-fashioned, disapproval] ⇒ ...this bunch of irresponsible young whippersnappers.