The contoured shape of a Coca-Cola bottle was based on the curvy shape of a cocoa bean. Similarly, the term "Coke bottle body" or "body like a Coke bottle" refers to the curvaceous body of a woman whose bust and hips are roughly the same in measurement.
The term "Coke bottle body" is synonymous with having an hourglass figure. An hourglass figure, also known as a butternut squash or figure-eight figure, is one in which the bust and hips are nearly the same size, and the waist differs from either of these measurements by 10 inches or less. A famous example of a woman with a Coke bottle body is Marilyn Monroe, whose measurements were 37-22-35.