dirty dirty n. the southern United States; the South. Also durrty durrty. Editorial Note: Usually used with the definite article: the dirty dirty. Capitalization is inconsistent. Etymological Note: From “Dirty Dirty South,” heavily influenced by a trend of southern hip-hop music called “Dirty South.” The spelling durrty is closely associated with hip-hop music. (source: Double-Tongued Dictionary)
The “dirty dirty” is taken from the term “dirty south” commonly attributed to Atlanta based and Dungeon Family affiliated rapper Cool Breeze who released Eastpoints Greatest hits in 1999.
The “Dirty” in dirty south can refer to the storied history and social conflicts in race relations. Touched on in Goodie Mob’s “Soul Food” [eg. Cell Therapy] album as far as government corruption, an impending race war and modern day out-right discrimination that is still allowed to continue. Wikipedia lists it as a style of music but it is the state of the south that got turned into a catch phrase and people identify with but it was from much deeper roots.