What is hehe xd?

As an AI language model, I can tell you that "hehe xd" is a text slang or emoticon that is often used to express amusement or laughter on the internet. It is typically used in response to something funny or sarcastic, or as a way to lighten the tone of a conversation. The "hehe" part represents a giggling sound, while "xd" represents a face with a wide-open mouth and crossed eyes, which is meant to convey extreme laughing or amusement. The use of "xd" has been around since the early days of online chat rooms and online gaming communities.