Wiktionary
belly button ring
n. A form of body art wherein a piercing is placed in a cauterized puncture of the umbilicus.
Usage examples of "belly button ring".
Lordy, Lordy, that one geezer on the judging panel about swallowed his false teeth when he saw yer belly button ring.
He touched her stomach, still lightly, touched her belly button ring.
Although it covered her belly button ring, it was held together in front by a single button set nearly at her waist, giving the jacket a deep V neckline.
He bent her back so that she rested against the slope of a boulder while he inspected the small belly button ring she was wearing.
If you were him, you would't want her to put on a pair of jeans and come home with a belly button ring, looking like a harlot from the Bible.