the cat's whiskers （非正式）优秀人物，上等货

【例句】
My new boss thinks he is the cat's whiskers though he is no better than the last one.
我的新老板自以为了不起，其实他和上任老板没什么两样。

That girl won the championship, but I think you are the cat's whiskers.
那女孩虽赢得冠军，但我认为你还是最棒的。