from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Alternative form of bumper-to-bumper.
Sorry, no etymologies found.
The cars came in droves, lining up bumper to bumper all the way out into Quintard Avenue.
In short order, the lanes immediately in front of the Piney Ridge refreshment station were jammed with cars full of citizens, bumper to bumper and door to door in either direction, frozen solid.