A small unnatural crease, often barely visible, at the bottom of a surgically enhanced breast.
Did you see that model on Deal or no Deal last night? As she leaned over to open her case, her dress was cut so low you could see her tittyfold.
A woman "going commando", or the female's version of "freeballing."
Oops, she did it again - apparently Britney decided to free clam that day and gave the photogs another free show.