Barrack for
To support a team.
Person 1"Who do you barrack for?"
Person 2"Collingwood, sorry to say."
"She's barracked for the Swans since she was five."
Where it's from
In the 1880s barracking meant jeering at the other side. Within a few years it also meant cheering for your own.

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While you're here
Football. Which code depends on where you live: AFL in the south and west, rugby league in NSW and Queensland. Either way, best sport in the world.
Shouted at someone, often a batsman, who isn't trying hard enough.
Courage and fighting spirit, mostly said about sportspeople and teams. Also slang for the heart.
Come on. Shouted from the stands to get your team going.
Yelled at an opposition player lining up a shot at goal, hoping they miss.
A spectacular high mark taken by jumping onto another player's back.