The phrase comes from Russian streamer Kuplinov, whose live reactions are widely clipped and shared by Russian-speaking viewers. Eto chto, literally what is this, is the kind of short, puzzled line that travels well outside its original stream because it needs no setup to understand. Editors began reusing it as a reaction sound for odd discoveries, failed experiments and surprising gameplay moments, and it has stayed popular as a quick way to signal disbelief without adding a long explanation.
About this sound
KuplinoV's confused Russian reaction clip asks 'what is this' and is used by stream fans for surprising, weird or unexpected moments in videos.
KuplinoV delivers a short, baffled Russian reaction in this clip, repeating the question eto chto, meaning what is this, in a rising, incredulous tone that sounds like he has just seen something he cannot explain. The delivery is quick and expressive, with a pause that lets the confusion land before the clip ends. It works because it is instantly relatable: everyone has stared at a strange scene and asked the same thing. Dropped into a video, it turns an odd reveal, a glitch, or an unexpected twist into a shared joke, making the audience feel the streamer's surprise along with him.
