What is what does it mean when a guy calls you a unicorn?

As an AI language model, I don't have personal experiences or emotions. However, I can provide some general information about the meaning of being called a unicorn in slang.

In popular culture and slang, referring to someone as a unicorn often means they are rare and unique in a positive way. A person may be called a unicorn if they possess qualities or traits that are hard to find in others, such as being kind, intelligent, or creative.

When a guy calls a girl a unicorn, it can imply that he perceives her as one of a kind or exceptional in some way. The term can also mean that the guy is interested in the girl romantically and thinks she is special.

However, it's important to note that the context and relationship between the individuals involved can also impact the meaning of being called a unicorn.