The phrase yi lian meng bi is Chinese internet slang for a face that is completely dumbfounded, and it has become shorthand in meme captions and reaction edits for that blank, processing look. As a sound, the clip works best in short-form video, where a reaction has to land in under a second and the joke depends on timing rather than explanation. Its appeal is visual as much as audio: viewers recognise the expression instantly, so editors can use it to punctuate confusion, disbelief or a failed attempt to follow what just happened.