asphalt jungle
An overcrowded, unsafe and/or crime-ridden urban environment or city, characterized by the congestion of large buildings and roads. Primarily heard in US, South Africa. After 10 years living in that asphalt jungle, I'm looking forward to being in a place with a bit of grass and friendly neighbors.
asphalt jungle
n. the paved landscape of the city; the city viewed as a savage place. I don’t look forward to spending the rest of my days in an asphalt jungle.