Put it immediately after the reveal in a fail edit, then follow it with awkward crickets while the camera lingers on the damage. For a bigger reaction, lead in with a drawn-out yooooo before this clip answers it, keeping the sequence short and focused on the mistake.
About this sound
This 10-second clip features one exaggerated male voice blurting 'oh my god bro, hell naw man' in a rush of surprise that curdles into disgust. The delivery feels annoyed, confused and repelled at once, turning a simple reaction into a punchline. It works because the speaker escalates so fast, making the rejection sound bigger than the moment that caused it.