Place it as the final beat of a failed attempt, after the setup has already landed flat. Open with Awkward Crickets for the awkward beat, then bring in this clip, and follow with Naruto Sadness and Sorrow if you want a longer closing moment.
About this sound
This nine-second clip features a man voicing disappointment in Portuguese, his sad delivery pushed through heavy distortion until it sounds blown out and rough. The result feels awkwardly funny rather than purely gloomy, turning a small letdown into an over-the-top moment. It circulates online as a Portuguese-language reaction sound, without a clearly credited film or show behind it.