The sexual act of nipple-to-nipple deffication, resulting in a cemen puddle slash. To create a fecal bridge from one breast to the other, only to break the feces with an erection into an awaiting pool of cemen. Commonly know as a form of foreplay.
Scott played "breaking the bridge" on Natalie's tits. He connected her boobs together with poo, and broke the bridge into a load he blew earlier.