The exact original source of this audio is not clearly established from the available information, but it circulates online as a short Portuguese reaction clip. Sounds like this often spread through meme pages, reposts and WhatsApp forwards, where a simple spoken line becomes a reusable joke. “Certamente que sim” stays useful because it is easy to understand, easy to place after a setup, and flexible enough to sound sincere, smug or ironic depending on the edit.