The word "嚓嚓" is formed by reduplicating the character "嚓", creating an onomatopoeic term that mimics repetitive sounds such as rustling or crackling. The character "嚓" itself is constructed as a phono-semantic compound, combining the semantic radical "口" (meaning "mouth", often indicating sounds) with the phonetic component "察" (pronounced chá), which approximates the character's pronunciation.