knee-slapper

My colleague opened the meeting with a knee-slapper, and even the boss cracked a smile.

用法提示：knee-slapper 为名词，作介词 with 的宾语，指非常好笑的笑话。

That knee-slapper she shared at lunch was so funny that I had to save it in my notes.

用法提示：knee-slapper 作句子主语，表示那则笑话令人捧腹。

His set is full of knee-slappers, so you’ll definitely laugh more than once.

用法提示：knee-slappers 是复数形式，表示多个非常好笑的笑话。