The phrase comes from Brazilian internet humor, where short Portuguese voice notes are shared and replayed out of context until a normal sentence becomes a meme. Chuva fraca bota capa spread mainly as a WhatsApp-style audio, passed around during rainy days and reused whenever the weather turned. Its appeal is the everyday wording and serious tone applied to weak rain, so it stayed useful beyond one moment and became a general joke about preparing too much for something small.