The phrase spread as a reusable reaction sound on short video platforms, where creators lifted the short voice line from its original context and placed it over unrelated clips. Its spelling with da reflects the casual pronunciation heard in the recording and became the form people search for and caption. Over time it joined other short disbelief sounds used in gaming edits, comment style videos, and meme compilations. It remains popular because a single line instantly signals confusion without needing any setup or explanation from the creator.