The phrase comes from Russian online speech, where blood from ears is an idiom for audio that feels unbearable, especially terrible singing or harsh, grating noise. As a sound, it works because the idiom is widely understood as an exaggerated complaint, so it needs no explanation when it appears in a short video. It fits the reaction-sound format popular on short-form platforms, where a spoken line can stand in for a facial expression. Its use comes from that simplicity: whenever a creator wants to say, without words of their own, that something sounded awful, this clip says it instantly.