The phrase oh la vache is a familiar French expression used in place of a stronger swear word to show surprise, amazement or disbelief, much like saying holy cow in English. In this clip, it is addressed to Kali, which gives it the feel of a personal reaction rather than a generic sound effect. Short reaction clips like this travel well online because they are instantly understandable even without subtitles, and creators reuse them to add humour and personality to memes, short videos and streams. Its brevity and clear emotion keep it useful long after its first upload.