Carfuck
A clusterfuck of cars.. like when the traffic light turns red and there are 8 cars in the intersection, then the other light turns green so there are another set of cars trying to get into the intersection as well. Can also occur when an accident happens and a pile-up of cars in the accident and otherwise stop traffic, causing a Carfuck.
Oh man, we're trying to turn left but there's a huge Carfuck blocking our way!