It’s known as "navel pulling," and involves massaging castor oil on your belly button and abdominal area. To do what exactly?

Once it fell into the belly button, it wouldn't easily come out again. But perhaps there are some other factors involved . . . Do you have a snail trail? - About 80% of people who have BBL also ...

Doug suffered from/enjoyed BBL. He thought that the hair on his belly was "channelling and concentrating lint from his clothes into his belly button". So he decided to test this theory.