Kardashian, ever the opportunist, no doubt surveyed the gluteus landscape and wanted in on the cultural “conversation.”
"buttocks muscle," 1680s, from Modern Latin glutaeus, from Greek gloutos "the rump," in plural, "the buttocks."
gluteus glu·te·us (glōō'tē-əs, glōō-tē'-)
n. pl. glu·te·i (glōō'tē-ī', glōō-tē'ī')
Any of the three large muscles of each buttock, especially the gluteus maximus, that extend, abduct, and rotate the thigh.