When a strap is placed between the boobs, this creates a boob strap.

That's the proof for everyone that has said my boobs are fake <3
A pumpkin spice latte and some bouncing titties on a sunny all drive.
Boobstrapping in action
Nude boob strap
Letting Them Out On The Way To Work
Stunning French girl drives with her tits out [GIF]
Elizabeth Olsen in Kodachrome
Flashing in CVS