whipper-snapper (n.)youdaoicibaDictYouDict[whipper-snapper 词源字典]
also whippersnapper, 1670s, apparently a "jingling extension" [OED] of *whip-snapper "a cracker of whips," or perhaps an alteration of snipper-snapper (1580s). Compare also late 16c. whipperginnie, a term of abuse for a woman.[whipper-snapper etymology, whipper-snapper origin, 英语词源]