"Busty" was the architecture of her—the generous, defiant silhouette she cast against the blinding sun. "Dusty" was the grit in her laugh, the fine silt that settled in the creases of her elbows and the hollow of her throat, proof she worked on a broken-down Ford pickup with more faith than a preacher. And "Sexy"? That wasn't about the shape or the dirt. That was the look she gave you over the rim of a sweating glass of iced tea—a slow, unbothered burn that said she knew exactly what the phrase meant, and she’d already decided you weren't tough enough to handle all three words at once.
While the term is modern, the archetype is ancient. Let's look at the canonical examples. busty dusty sexy
If you are looking for information on the individual components often associated with this phrase in internet culture, they usually refer to: "Busty" was the architecture of her—the generous, defiant