The ka-ching has been a stock sound effect for decades, long before it became a staple of online video, because it instantly signals a transaction without any words. On YouTube, TikTok, and in short memes, creators reuse the same short ding and drawer noise to mark earnings, spending, jackpots, and ironic flexes. Its brevity makes it easy to drop into edits, reaction clips, and comedy sketches, which is why it has stayed popular even as newer money sounds appear.