street smarts

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun plural Shrewd awareness of how to survive in an often hostile urban environment.
• noun plural Practical knowledge, especially in a specific area of endeavor.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Practical knowledge, especially concerning human behavior.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a shrewd ability to survive in a dangerous urban environment