"Dirty Bronx” is a hip-hop name for the Bronx that has been cited in print since at leas 2004. “Dirty” can mean unclean, but it also means dangerous or violent.
Wikipedia: The Bronx
The Bronx /ˈbrɒŋks/ is the northernmost of the five boroughs of New York City, within the U.S. state of New York. It is geographically south of Westchester County; north and east of the island and borough of Manhattan to the south and west across the Harlem River; and north of the borough of Queens, across the East River. Of the five boroughs, the Bronx is the only one that has the majority of its area on the U.S. mainland and, with a land area of 42 square miles (109 km2) and a population of 1,455,444 in 2015,
30 December 2004, Rolling Stone, “The 10 Best Singles,” pg. 144:
Now that’s what you call a chain reaction: Fat Joe takes his dirty Bronx posse to the top of the charts and starts a dance craze. Somewhere, Big Pun is smiling.
Uploaded on Feb 14, 2006
True HipHop from the streets of the Bronx
U mean the dirty bronx right @jah3 ?RT @Show23: http://twitpic.com/8zv3e - it gets worst and worst at tme passes...welcum 2 da south bx
7:21 PM - 1 Jul 2009
@sara_jansson PS why is your location set as ‘the dirty bronx’ that makes no sense
9:41 PM - 21 Dec 2009
DaRubbaRoom - Dirty Bronx
Uploaded on Dec 29, 2009
Instrumental Beats (copyright)
I wonder y the Bronx is called Dirty Bronx? Hmmm
4:43 PM - 23 Nov 2010
Dr. Peter Venkman
Its called the Dirty Bronx for a reason!
2:38 PM - 20 Nov 2011
Youth Identities, Localities, and Visual Material Culture:
Making Selves, Making Worlds
By Kristen Ali Eglinton
New York, NY: Springer
Louis lived with his mom and older sister in what he and his friends, using hip-hop vernacular, called the ‘dirty Bronx’.
Any twitter handle with “dirty bronx..” is one im gonna follow
12:55 PM - 6 Sep 2016