‘Cáo cáo’ is a reduplicative onomatopoeic adverb that vividly mimics loud, chaotic, overlapping sounds—like shouting, arguing, or general hubbub. The character 嘈 (cáo) by itself means 'noisy' or 'clamorous', and its repetition intensifies the sense of persistent, unstructured auditory chaos. It’s not used to describe a single sound but rather an ongoing, messy sonic environment where voices or noises blend indistinctly.

This word appears most often in descriptive writing or spoken narration, especially when evoking crowded urban scenes, bustling markets, or heated group discussions. While it carries a slightly negative connotation—implying unpleasant or overwhelming noise—it’s neutral in grammar and doesn’t inherently judge the speakers; it simply paints the acoustic texture. Unlike nouns like ‘noise’ (噪音), ‘cáo cáo’ functions adverbially, modifying verbs (e.g., 说话, 吵闹) to indicate *how* something is said or done—i.e., in a clamorous, unintelligible way.