Car Droppings
In the winter; a mixture of snow, sand, salt, and dirt that builds up underneath cars primarily around the wheel well and drops off in chunks in parking lots and along roadways when the weather warms.
Man, look at all those car droppings!
drop car
The car that is left behind (usually stolen) for the police to find after a bank robbery. Stolen specifically for illegal acts.
"The drop car is up on Mulholland Drive." From the movie Point Break.