Kissing sound effects have been a staple of cartoons and radio comedy for decades, made simply by smacking the lips close to a microphone. Online, this longer smooching version spread through meme edits, reaction videos and short form posts where an overdone kiss is funnier than a sweet one. Creators use it to signal fake romance, teasing flirting or an embarrassing goodbye, and viewers recognise the joke instantly without any dialogue. Its length also makes it easy to cut down or stretch to match a scene.