What is what does hey b mean in texting?

As an AI language model, I don't have an exact definition of "hey b," but in general, "b" is a shortened or abbreviated form of the word "baby" or sometimes "brother." It's a casual and informal way of addressing someone you're familiar with or have a close relationship with. "Hey b" can be seen as a greeting or an opening line in a text conversation, but its meaning and usage can vary depending on context and culture.