What does this word mean?
It has been one of the most popular Internet words since 2008. With the original meaning of thunder, the wor("雷"Léi) has been given another meaning on the web. Now it means that one is shocked by some bold actions, or by strange or even embarrassing things. It is said that this word is originated from the word "雷倒" (léi dăo), which is the dialect of "浙江" (zhèjiang) province of China.
How to use the word?
You can say "我被雷到了" (wŏ bèi léi dào le) or "好雷人啊" (hăo léi rén a) to express "I am shocked". So there are many circumstances for you to use this word. For example, after watching a video in which a bear dances like a ballet dancer, you can say "我被雷到了" (wŏ bèi léi dào le) to express "I am shocked by this bear".