Meaning:
Literally this term means “undescribable.” In April this year, a piece of news posted by Guangzhou Daily Weibo used the term to describe a couple having sex in their car parked in a tunnel on an expressway in Hubei Province in the wee hours. A traffic policeman knocked on their car window for a few minutes before the two opened the door. They gave a weird explanation for their conduct, saying they were too tired to drive and needed some stimulus to help them focus. Netizens found the phrase “undescribable” a hilarious euphemism, and have since used it to refer to sex, especially sex in not quite appropriate situations.
Example:
A: 小丽和男朋友分手了。
Xiǎolì hé nánpéngyǒu fēnshǒu le。
Xiaoli broke up with her boyfriend.
B: 为什么?
Wèi shénme?
Why?
A: 她出差提前回来去找他,发现他和一个陌生女人在不可描述。
Tā chūchāi tíqián huílái qù zhǎo tā, fāxiàn tā hé yīgè mòshēng nǚrén zài bùkěmiáoshù。
She was back early from a business trip and went to his place, but caught him doing the “undescribable” (having sex) with a woman she didn’t know.
(Edited by Stephanie Yang)