Seja bem vindo gato is a short Portuguese-language greeting clip that circulates on Brazilian soundboards as a humorous welcome sound, played over videos of cats and other animals making a grand entrance. Its exact original source is not documented, but the phrase itself is a common friendly way of saying welcome in Brazil, which is why the clip caught on among creators who make pet edits and reaction videos. With just over two seconds of audio, it has become a go-to reaction sound for lighthearted moments where someone or something new arrives on screen.