Open a WhatsApp chat skit with it as the first reply, then cut to the WhatsApp Message Sound Button for the incoming message and finish with Abriu o Áudio when the other person finally listens. Keep it at the front of a chat exchange so the online announcement sets up the next message.
About this sound
This is a three-second Portuguese voice note in which the speaker announces that they are already online, delivered in a quick, casual WhatsApp style. It feels playful and a little impatient, like a nudge to friends who are still taking their time to reply.