The sound is associated with Brazilian streamer Smzinho, whose loud live reactions are widely clipped and reused by Portuguese speaking audiences. The phrase ai debaixo is Portuguese and is shouted as a quick reaction from below or underneath something, which helps explain its use over falls and trapped moments. Short streamer screams like this spread through gaming clips, meme edits and message groups because they are easy to recognise, need no context and can be dropped into many different funny situations online.