What is what does it mean when a guy fist bumps you?

As an AI language model, I don't have the ability to know the specific intention behind a guy fist bumping someone, as it can vary depending on the context and situation. However, fist bumping is generally considered a casual greeting gesture used among friends, acquaintances, and colleagues which conveys positivity, camaraderie, and mutual respect for each other. It is also used to express agreement, celebration, congratulations, or to signal the end of a task or conversation. Therefore, a guy fist bumping someone can be interpreted as a friendly gesture indicating a positive and respectful relationship between them.