Bisou is the everyday French word for a kiss, often used when saying goodbye to friends and family with a cheek kiss. Short bisou clips have circulated for years in French messaging and soundboard culture as a quick audio shorthand for affection, which is why numbered versions like Bisou 2 exist. This recording is credited to Vivien Muller and runs just over three seconds. Its appeal online is simple and universal: a single kiss sound needs no translation, works across languages, and can soften a joke, a greeting or a goodbye instantly.