我说话雷人
Wǒ shuōhuà léi rén
Have you ever had someone say this to you?
雷 directly translates to lightning or thunder. However, in this case, it means that the words that you say are very shocking.
In a way, the word lightning is used as a descriptive word to the concept of being shocked.
There is a longer version of this phrase:
我说话雷人，为人有点疯。 你们叫我雷锋就好
(Wǒ shuōhuà léi rén, wéirén yǒudiǎn fēng. Nǐmen jiào wǒ léifēng jiù hǎo)