The word "过瘾" is formed by combining the character "过", which means to pass or exceed, with "瘾", which means addiction or craving. In this compound, "过" conveys the idea of thoroughly undergoing or surpassing a limit, while "瘾" denotes a persistent desire. Together, they create a literal sense of "passing addiction" that idiomatically expresses the satisfaction of a craving to the fullest, thus indicating intense enjoyment or pleasure derived from an activity.