the cat's meow 卓越的(或出色的、极好的)人(或事，物)

【例句】
That guy thinks he's the cat's meow.
那个家伙认为自己最了不起啦。

That singer last night was the cat's meow, wasn't she?
昨晚那位女歌手真的太棒了，不是吗？