The word 稀里哗啦 is formed through phonetic imitation, where each character contributes to replicating a complex sound: 稀 (xī) and 哗 (huā) directly mimic auditory elements, while 里 (lǐ) and 啦 (lā) serve as syllabic inserts that create a rhythmic, four-character template for emphasizing continuous or chaotic noises.