This greeting comes from Tom and Jerry, the long-running animated series about a cat and mouse, where a small duck delivers the morning song in a sweet, high-pitched voice. Shared online as a short audio clip, it became a popular way to say good morning in Portuguese-speaking communities, especially in playful messages and morning videos. Its appeal has lasted because the sound is short, instantly recognisable and easy to reuse, turning a brief cartoon moment into a familiar greeting that feels personal, funny and warm rather than formal.