The phrase itself is everyday French for how bizarre something is, and that plain wording is part of its appeal online. As a short voice clip it circulates as a reaction sound, often attached to videos where the visual does the explaining and the voice simply confirms the strangeness. Because it is only a few seconds long, it fits easily into short-form edits, story replies and meme compilations without breaking the pace. Its humor comes from understatement rather than exaggeration, which keeps it reusable across different kinds of strange, awkward or surprising content.