Smacking sounds have long been used in cartoons, Foley work and everyday voice notes to imitate kisses, eating and light contact, and this short version spread as a generic soundboard clip rather than from a single film or show. Its appeal online is its ambiguity, since the same pop can read as a kiss, a tasty bite or a cheeky smack depending on the image paired with it. That flexibility keeps it in meme edits, reaction videos and short form comedy where a fast audio cue is needed.