@d3112 I think that she is talking about having the space between the boobs enlarged. Think about the shape of sunglasses, or the difference between "B" and "3"
@d3112 It's hard to explain, but when (some) tits get big enough they sort of start to form an overlapping section on the torso. You can see it best on page 5 & 7, there's no "chest" between the breast fat, its all just titty.