Put it directly after the garbled line in your edit, then follow it with Bruh for the next beat, or with Emotional Damage when the misunderstanding is the joke itself.
Über diesen Sound
This is a brief Portuguese voice clip, under two seconds long, in which a man says he did not understand what the person speaking to him just said. The flat, baffled delivery makes it feel funny and awkward, like a shrug in audio form. It comes from Pânico, the Brazilian television show.