I am a BE speaker, not AE, but as it is a slang term I daresay you could choose either. I would plump for besty as bestie looks a bit too much like beastie. Have you asked your besty how it should be spelt?Ede said:Hi, I have a question about some American slang...
My friend told me that I am her "besty" or "bestie" (I don't know how it is spelled!), but I assumed that she means I am her best friend, right?