Place this clip as the final reply in the edit, after a dismissive setup and before a stunned reaction closes it. Start with the we do not care button to set the attitude, follow with this clip, then finish with the auughhh meme for the group's horrified response on top.
About this sound
This is an eleven second voice clip of someone saying the Portuguese phrase eu vou cagar na tua boca, a crude threat spoken in full. It feels deliberately gross and over the top, the kind of shock and disgust that turns an insult into a joke between friends who know it is not meant literally at all.