Put it last in a reaction chain, after the offending moment has played out in full. Lead in with a bruh moment to hold the stunned beat, then use this clip as the closing verdict before you cut to the next scene.
About this sound
A short voice clip of a Japanese creator saying 'gehin da naa', a drawn-out reaction meaning that's so crude, lasting just under two seconds. It lands as teasing and mildly disgusted, the kind of prim disapproval that makes an embarrassing moment funnier. The clip comes from HikakinTV.