Killer = Excellent,outstanding

　　很棒，非常好，

　　Have you tried the burgers at that restaurant? They are killer.

　　你尝过那家馆子的汉堡没？太棒了！

　　Man!The movie we saw last night was killer.

　　我的天呐！我们昨晚看的电影真是太棒了！

　　kill v. 让某人捧腹大笑

　　He's really a good comedian and almost killed me.

　　他真的是个很好的喜剧演员，几乎快笑死我了。

　　kill time打发时间

　　I like to kill time by watching American TV shows.

　　我喜欢通过看美剧去打发时间。

　　Curiosity killed the cat.

　　好奇害死猫。

　　Kill two birds with one stone.

　　一箭双雕。