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!"
Person 2: " Yea bro, that seat-belts lucky!"
by 1234#swag October 29, 2011
by AB3 February 22, 2015