from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A sticker bearing a printed message for display on a vehicle's bumper.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An adhesive label or decal, usually applied to the bumper or back end of an automobile, and displaying a short political, promotional, philosophical, or humorous message.
- n. Metaphorically, said of canned insight; a slogan or saying that is trite or lacks depth.
bumper + sticker (Wiktionary)