What is what does it mean when someone calls you sunshine?

Being called "sunshine" is typically a term of endearment and carries positive connotations. It suggests that the person being addressed brings warmth, light, positivity, or happiness into the lives of others, similar to the way sunshine affects the environment. Often, it implies that the individual has a cheerful, bright, or uplifting personality.

However, as with any nickname or term, the context and tone in which it is said can also affect its meaning. In most cases, though, being called "sunshine" is a compliment meant to express fondness or appreciation.