美国街头常用英语俚语O-3: Off the top of one's head/ Off-the-wall (mp3和文本下载)

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1. Off the top of one's head 不假思索，马上

I can't tell you the figures off the top of my head. I'll have to check it up.
我无法马上告诉你具体数字，我还得查一下。

2. Off-the-wall 古怪的，离奇的

He said some really off-the-wall things. Where does he come up with them?
他说了一些非常离奇的事。他从哪里听来的？

疯狂联想：人们认为怪人都会用头撞墙bounce off the wall。