the.com/hindquarters

means The rear portion of a four-legged animal's body, including the hips, rump, and hind legs.

from A straightforward compound: 'hind' (meaning rear or back, from Old English 'hindan') joined with 'quarters,' a term butchers and herders used for the four major divisions of an animal's body — foreleg-and-shoulder sections up front, hip-and-leg sections in back. So the word is literally doing its job: naming the back quarters, no poetry required, though the image has since wandered into comic territory for describing anyone's backside.