1. Huh is a term used in chat that expresses uncertainty or astonishment about someone or something in chat or other text-based communications. Below are some examples of how this could be used in chat.
User1: asd udf lkdff asdfe
User1: Did you know that Microsoft was founded in 1975.
User2: Huh. I did not know that.
2. Short for Have You Heard?
Also see: Chat terms