This clip is best known online as a Vietnamese reaction sound shared across meme pages, reposts and short-form video edits. Its exact original source is not clear from the available information, but the phrase has spread because the delivery is instantly expressive even for viewers who do not speak Vietnamese. Like a quick bruh-style reaction, it is used to mark confusion, disbelief or secondhand embarrassment. Its staying power comes from being extremely short, easy to place on a cut, and funny without needing much setup.