The Collaborative International Dictionary
Brickfielder \Brick"field`er\, n. [Australia]
Orig., at Sydney, a cold and violent south or southwest wind, rising suddenly, and regularly preceded by a hot wind from the north; -- now usually called southerly buster. It blew across the Brickfields, formerly so called, a district of Sydney, and carried clouds of dust into the city.
By confusion, a midsummer hot wind from the north.
Wiktionary
n. (context Australia chiefly New South Wales English) A summer cold front which works its way up the coast, bringing strong cool southerly winds to replace and relieve hot conditions.
Usage examples of "southerly buster".
We spend February and March praying for a Southerly Buster, which is a south wind that cools everything down.
Malone had lit some burners to repel any mosquitoes, and a gentle breeze, all that was left of this afternoon's southerly buster, rustled through the jacaranda in the Cayburns' back yard.