The unfortunate (but often hilarious) result of a busty woman fitting herself into a swimsuit too small for her body. The suit's tight fabric crushes her breasts together, creating a single, enormous boob in the center of her chest.
A word used to describe boobs of Amazonian war princesses who wanted to cut off their boobs for better performance at battlefields but made a compromise to cut only one side as they had to breastfeed babies. It is an old, traditional custom that goes back to as far as the Golden Age of Greece, but is often overlooked by commercial businesses that make movies with pretty girls that have both wild tendencies and boobs.
monoboob - gene disorder in which females are born with a morphed gene that results in the growth of a 'double boob'. Operations can be carried out to separate the monoboob but this is a risky process as it is so close to the heart. Although, a scan can be done at birth if the child is to thought to have this gene (inherited from parents) which enables them to see the gene and split it or remove a part of this which would result in the normal growth of breasts on the child.