The phrase comes from Russian, where chto means what and mikroavtobus means minibus or shuttle van, and the clip circulates mainly through Russian speaking meme and soundboard communities. Its exact source is not widely documented, so it spread less as a famous movie quote and more as a reusable reaction line detached from its context. That detachment helped it travel, because anyone could apply the confused question to unrelated situations. It remains popular in short edits and chat replies where a mundane word is treated as shocking, surprising, or completely out of place.