whippersnapper
n. 傲慢的傢伙,自以為了不起的年輕人,不重要的人
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.
...this bunch of irresponsible young whippersnappers.
這群不負責任自以為是的年輕人
1. someone who is unimportant but cheeky and presumptuous
How can I take care of this whippersnapper?
我如何對付這個自以為是的年輕人呢?