When one is wearing shoes and the gap between the big toe and the second toe is showing and looks like the effect that is achieved when two breasts are pushed together.
"Those shoes had such a shallow place for the toes. It was a toecleavage extravaganza."
The fleshy sections between and around the toes which can be squeezed together to form cleavage when wearing low-cut or strappy type (infact any kind of toe exposure) shoes or heels. This is used to attract members of the opposite ( or in some cases 'same') sex who find this appealing.
in a closed toed shoe usually a high heel pump, it is the area where the big toe and the index toe meet at the foot and you can see the line (cleavage) from outside the shoe
oh man did u see that lady's toe cleavage. it's nasty cause she got's bunions all over her feet.