The pinyin acronym of the Chinese term “瑟瑟发抖” (sèsè fādǒu, meaning “shivering”), this secret code kind of usage was invented by and made popular among the generation Z in China. It’s often used by the speaker to express their feelings of misery, fear and frustration, especially when someone is a rookie in a certain field. By showing their weakness, the speaker also tries to arouse sympathy in the listener.
Zuótiān kāihuì dàjiā dōu jījí tí yìjiàn，nǐ zěnme méi shuōhuà？
Everyone else was active giving their opinions at the meeting yesterday. Why didn’t you speak out?
Nǐmen dōu tíchū le shēnkè dútè de jiànjiě，wǒ tài fūqiǎn，ssfd。
You all gave profound and unique suggestions. I found my thoughts shallow, and felt too intimidated to talk.