When a female has her seat-belt on and it crosses between her boobs making them look bigger in size which would later create a boner for the guy sitting in the car next to her looking at them.
"Hey Chubb's look at blonde in the car next to us. She has some awesome seat-belt titty's. I'd sure like to stick my cock between them"
by Tasty Cake's Brother July 17, 2009