A neighborhood where you can count three or more Priuses (Prii?) in consecutive driveways or parked out front if it's a really urban Prius pocket.
Honda Insights and Ford Escape Hybrids can be substituted for Priuses to meet the minimum threshold of three.
We accidentally drove through a Prius pocket, but the green zombies
were all inside their solar
salons and did not attack our 8 cylinder lifted pickup truck.