I interpret your question in 2 ways. I'm not sure which way you meant.
1. First interpretation is you asking if a man can be considered beautiful if he is big. The answer is yes; this is provable in many ways.
2. Second interpretation is you asking if the label BBM exists or could be created and applied. I haven't heard of that, maybe it does. As for creating a label for big, beautiful men, go for it.