It might be an intentional 'non-northern-hemisphere-centric' construct. I had not heard it before but in a way it does make sense given that a sphere does not have a defined 'top' and 'bottom'. Then again the one we live on has a defined 'north' and 'south' and north tends to be thought of as 'up'.
I've been thinking, it could mean it doesn't matter which direction you go, cause I'd think north or south of Brisbane is same, wildlife is gonna try to eat/kill/sting you