A B
How big your boobs are compared to your belly. It's a thing. Some people take it seriously. Others just use it to judge you.
My B2B ratio is 10. My sister's is 2. She's a goddess.
He asked me my B2B ratio. I asked him if he wanted to know my waist-to-hip ratio.
My B2B ratio is 1. My dog's is 100. He eats too much.