The phrase et ça j'achète is everyday French for and that, I'll buy it, and as a sound it circulates mainly as a short reaction clip rather than a line tied to a widely documented film, show or viral moment. Its appeal is practical: creators do not need viewers to understand every word to get the meaning, because the tone alone sounds like eager approval. Online it is most often used over shopping, haul, fashion and food content, where a quick spoken verdict can replace a longer caption and keep a fast-paced edit moving.