In this internet era, people have easy access of a vast many options of social media platforms for quick communicating or interacting. The ways how internet users conveyed their emotional expression attracted our interest. This present paper investigates the literal emotional expression of ANGER in Chinese online discussion forum, targeting the term nu4 ‘angry/anger’. We referred to a Bulletin Board System (BBS) in Taiwan which is a conversation-like platform with no emoji icon to convey emotion directly. A collection of 7,464 instances were retrieved from the platform. After deducting noisy data, we looked into the meanings and distribution of nu4 of the 7,285 instances. With nearly a quarter of the data instances belonged to the unconventional use of nu4 where the expression does not necessarily show the emotion of anger, we further analyzed the col-locations of these instances. In conclusions, from the collocates of these unconventional use of nu4, it showed a shift from the expression of emotion to aggressiveness, and to express the extent level of an action.