The phrase comes from everyday Brazilian Portuguese, where vc is the common texting short form of você and cansada is the feminine form of tired. Clips built around short, relatable questions like this spread through WhatsApp audios, group chats, and short video edits because they can be dropped into many situations without context. Its popularity online rests on that familiarity rather than a single known source, and creators keep reusing it as a light, teasing reaction for moments of visible exhaustion, boredom, or low energy.