The censor beep comes from television broadcasting, where a steady tone has long been used to mask profanity and other words unsuitable for broadcast. As video editing became accessible online, creators copied the same trick for YouTube videos, streams, pranks and memes, using it to keep content advertiser-friendly while still hinting at what was said. It remains popular because it is instantly understood, works in any language, and turns a simple edit into a joke in itself, signalling to viewers that something cheeky has just been hidden.