Place it right after the reveal in a reaction edit, then follow it with Eww Brother Eww for a second reaction before cutting to the next clip. For contrast, put Oh My God Wow just before it, so the first reaction sets up the second.
Über diesen Sound
This two-second clip is a single drawn-out vocal groan, stretched into a slow, guttural 'eughhhhh' with no other words or music. It feels instantly disgusted and playfully dramatic, like someone recoiling from something gross in front of them. It comes from Plainrock124, whose exaggerated reaction sound has become a handy shorthand for cringe and revulsion.