a nickname for the city of detroit, that is a spin off of the main area code313.
can be spelled in any variation, for example 30-1-3rd, or thirty-1-third.
if u ain't heard, i'm from the 31-3rd, the city of cars, also the city of stars, me and my nigga's say the city is scarred, from riots and snitches plus crack back in the 80's was large.
