The word "冲冲" is formed by the reduplication of the character "冲", a simplified form of the traditional character "衝". This duplication intensifies the base meaning of "to rush" or "to surge", resulting in a word that typically describes a state of agitation or haste, as in the compound "怒气冲冲" (seething with anger). The formation process is solely morphological, involving repetition without phonetic or semantic alteration to the individual characters.