The word "乱蓬蓬" is formed by combining the character 乱, meaning "disorderly" or "messy", with the reduplicated character 蓬蓬, where 蓬 originally refers to tangled or overgrown vegetation. The reduplication of 蓬 intensifies the descriptive quality, resulting in a compound adjective that emphasizes a state of extreme untidiness or dishevelment, often used for hair or foliage.