DA means district attorney. The relevance of this and urban terminology is it's connection with punishment for crimes. If you
get caught by the 'Po (police for yall) selling
drugs or whatnot, you will probably have to deal with a District Attorney. District Attorneys only practice law in district courts (imagine that). If you
murder someone or get caught with enough
coke to make a state, or even worse, a federal case, you won't be dealing with a DA, you'll be fucking with a whole new ballpark of lawyers and attorneys.
My homie Broham is in and out of
court for possesion of narcotics and unlawful carrying of a concealed
weapon. So, me and big 'Maal are about to show that fuckin DA how my
strap works.