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A whippersnapper is a young person who thinks rather too much of themselves — confident, cheeky, quick with opinions, and not showing the respect that an older person feels is owed. It is always said by an older person about a younger one, and the older person is almost always half-joking. The word sounds old-fashioned on purpose; today it is used with a smile, often as 'young whippersnapper', the way a grandfather might grumble at a who has just corrected him, or an old boss might say it about a new graduate who has ideas about everything. Because the tone is playful and dated, it lands as much softer than any real insult — calling someone a whippersnapper says 'you are young and full of yourself' and also 'and I quite like you'. If you used it seriously you would sound as if you were acting in a costume drama. It is a countable noun: a whippersnapper, two whippersnappers.
（老一輩戲稱年輕人）毛頭小子、乳臭未乾的小鬼、黃口小兒；語氣是打趣，不是真罵
組成Probably an extension of *whip-snapper, 'a cracker of whips' — someone who stands about noisily snapping a whip, making a lot of loud noise without doing real work. It may also owe something to 'snipper-snapper', an old word of the same kind. Compare 'whipperginnie', a 16th-century term of abuse for a woman.
原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
whippersnappernoun/ˈwɪpəˌsnæpə/
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A young and cheeky or presumptuous person; often with a connotation of ignorance via inexperience.
- These whippersnappers have never had to walk far or carry water.
- "Throw me a nine iron Fatman, I want to make sure of getting inside you young whippersnappers."
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。