Place it right after the unpleasant reveal, then follow it with Eww Brother Eww before cutting to the next scene. For a different follow-up instead, use Oh My God Wow after it to change the focus of the reaction.
關於此聲音
This is a short spoken reaction in Portuguese, lasting about 1.4 seconds, with a single voice delivering the phrase with a drawn-out, disapproving tone. It lands as a mix of disgust and dry amusement, the kind of sound that makes an awkward or unpleasant moment feel funnier without saying much more. It works best as a quick verbal eye-roll for something gross or cringeworthy.