What does Captive Hoops mean?

Captive Hoops meaning in Urban Dictionary

Circular Piercings inserted into piercings/pierced areas. Widely used in ears, bottom lips, eyebrows, noses, hard nipples and sporadically the belly button, penis and vagina.Usually they have been a circular piece of metal, with a ball holding the two pieces sealed so the piercing don't fall or fall out.Rarely are they silver, gold or cup.