Place it at the end of a fail sequence, just after the mistake lands, then follow it with Fahhhhh for a second reaction or Faaaa to keep the same gag going in another clip.
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This is a short, drawn-out vocal exclamation, a single stretched ahh delivered with exaggerated emphasis over about two seconds. It lands as funny, exasperated and deliberately over the top, the kind of sound that turns a small fail or an awkward reveal into a bigger, sillier moment. It works best as a quick reaction, letting the stretched voice carry the disbelief for you.