This sound comes from JonTron, the online comedy and gaming commentator known for exaggerated facial expressions and quick reaction noises in his videos. Short clips of his vocal outbursts spread through meme edits, reuploads and soundboards because they communicate a feeling almost instantly. The upset “ech” is still used when creators want a compact disgust reaction without needing a full spoken line. Its staying power comes from how recognizable JonTron’s delivery is, even in a half-second clip.