an amorphous undelineated mass of tit, often caused by old age sagginess or bras that squish them together. in theory, it could be a single cycloptic tit.

Condition when a woman wears a tight lycra fitted tube top for exercising and looses form of two boobs to just one

When it looks like you have one massive breast. This usally happens when a girl wears a sports bra or one of those tank tops with the shelf bra.

When a woman's bra isn't very supportive and doesn't separate, squeezing the boobs together, thus forming the appearance of one large boob. This usually happens with sports bras.

A case of the rare condition called symmastia, in which a woman's two breasts literally grow together and join in the middle of the chest, so it looks like a single dumbell-shaped breast across the chest. It can be a congenital condition or a complication arising from breast augmentation surgery.

Noun.

1. In art, a singular curve/line/lump of breast used to represent two boobs under clothing.

2. A single mass/breast where two should be, but not where two were originally (if you loose one boob, its not technically a uniboob). A uniboob is the presence of an original single boob.

when you zip up your sweatshirt all the way and you get that bump of sweatshirt that just so happens to be right where your boobs would be.