There are 2 results of your search for down South.
down South
the rest of Australia outside the northern territory: Things are done differently here compared to down south.
Contributor's comments: Used in Brisbane to describe NSW and Vic and maybe SA?
Contributor's comments: "Down South" is used in Brisbane to mean south of Brisbane eg Sydney.
down south
Dunsborough to Yallingup, WA: Going down south to get some surf in this weekend?
Contributor's comments: Refers to much more than just Dunsborough to Yallingup. I would call anywhere south of about Capel 'down south', including Augusta, Margaret River, Manjimup, Pemberton and proably Walpole and Albany.