cleavage belt 

When the seat-belt in a vehicle perfectly comes in between a women's breasts, producing a beautiful cleavage, outlining the women's breasts perfectly. A cleavage belt may also appear the women's breasts to appear bigger, and more seductively shaped.

Person 1: "Damn, look at that fine girls cleavage belt!"
Person 2: " Yea bro, that seat-belts lucky!"

cleavage belt by 1234#swag October 29, 2011

Belt Cleavage 

Another term for ass crack exposure the only difference being, we would like to see more. ~AB3

Sarah you have the best Belt Cleavage of any plumber we know.

Belt Cleavage by AB3 February 21, 2015