What is what does it mean when a guy says sure?

As an AI language model, I cannot know the specific context of your question. But in general, "sure" is a common response used by many people to mean "yes" or "okay". It can be used in a casual or informal conversation to express agreement or acceptance. It implies a willingness to comply with the request or suggestion made by the person who asked the question. However, it could also mean that the guy is not particularly enthusiastic or committed to the idea, and may be responding to avoid conflict or to be polite.