Place it as the final spoken moment in an edit, after the last line of dialogue and before any closing music, then follow it with the Bye Bye Mewing sound for a second farewell, or open with Tuco Get Out and let this clip answer it as the reply that closes the scene.
Sobre este som
This 14-second clip is one drawn-out vocal cheeriooo, held out in a friendly, open voice that stretches the farewell well beyond a normal goodbye. It feels playful and warm, like a farewell delivered with a grin, and gives an ordinary goodbye a small, memorable lift that makes it stick in the listener's mind.