The title comes from the Chinese idiom tong ku liu ti, which literally describes crying in pain until tears flow freely. Online, the phrase is used as a shorthand label for over-the-top weeping, and short clips tagged with it circulate as reaction audio for sad, embarrassing or melodramatic moments. Because the idiom is instantly understood by Chinese-speaking audiences, the sound works even without translation, and its exaggerated grief keeps it useful for memes, edits and short-form videos that need an instant emotional punch.