Place it right at the reveal in a reaction edit, after a beat of anticipation built with a sudden suspense cue, then follow it with eww brother eww if a second person piles on with their own disgusted reply for the group.
Sobre este som
This is a short roughly three second Japanese voice clip of someone blurting out kimosugii, meaning too gross, in a drawn out exaggerated way. It feels disgusted, cringey and playfully dramatic, like a reaction that is bigger than the moment deserves. The clip is credited to Amenbo Plus in its original title.