What is my crush called me boo?

As an AI language model, I don't have the personal information about your crush or your relationship with them. However, in general, calling someone "boo" may be a term of endearment or affection. It could be a cute nickname that they like to use for you. Alternatively, it's possible that they just use the term "boo" casually or habitually with friends and acquaintances, in which case it may not hold any special meaning. Ultimately, the best way to understand how your crush feels about you is to communicate openly and honestly with them.