Place it as the immediate reaction beat after the offending reveal, before you cut back to commentary. Pair it with the awkward moment sound for a lingering beat, or follow it with the SpongeBob disappointed sound when the moment turns from gross to letdown.
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This clip is a very short vocal disgust reaction lasting under a second, a single revolted exclamation delivered in the Doobus Goobus style. It gives a listener an instant feeling of being grossed out and recoiling from something unpleasant. It comes from How to get a Billion Dollars!