To go out with a bang 意思是某件事情成功地完成，并得到了人们的赞赏和雷鸣般的掌声。

例句

The festival went out with a bang when the world-famous rock band came on to play.

John got a karaoke machine for his leaving party to ensure that he went out with a bang!

The fireworks at the closing ceremony ensured that the London 2012 Olympic Games went out with a bang.

请注意

另一个通俗短语 to bang something out 意思是很仓促地完成一件事情。

I had to bang out my last assignment overnight as I'd completely forgotten about it.