胸大冒昧

This nickname combines a physical characteristic 'big chest' (胸大), which usually refers to well-endowed in the female context, and 'impertinence or rudeness' (冒昧). It implies a humorous, somewhat self-deprecating sense that contrasts traditionally desirable attributes with social manners. However, this type of naming can perpetuate stereotypes and is not widely used outside casual, intimate networks.