Breasts which have herniated nipple/areola complexes. A moderate degree of such herniation might produce a hemispherical appearance as if half a table tennis ball had been implanted under the skin.
Although this is technically a defect, many apparently find it sexually attractive, even intriguing.
Unless it is extreme, progressive, or of great concern to the patient, no remediation is normally indicated.
I love the puffies on that girl. I wonder, if I sucked them really hard, would they get even bigger?