A prostitute that targets motorists to offer her services, thus appearing as a hitchhiker. Especially common around gas stations used by long-haul truckers.
That hitchhooker tried to appear like a hitchhiker when whe saw a crown vic coming, but her whore outfit gave her away like nothing.
All in all, the best book ever. There are four more books in the series that nobody seems to know about. However, it doesn't really matter because the story sort of loses control of it self toward the end and I assume that is why all of the characters die at once, very anticlimactically.
According to the hitchhikers guide to the galaxy, 42 is the answer to the question of life, the universe, and everything.