The phrase comes from Russian internet slang, where chai is the everyday word for tea and the second word is a blunt vulgar dismissal, so together they read as a crude verdict on something unimpressive. As a short soundboard clip it circulates mainly through meme pages and short-form videos, where its brevity makes it easy to drop over a disappointing moment. It has stayed in use because the line is instantly understood by Russian-speaking viewers and because its flat delivery travels well even without subtitles.