Chewie on your boot
CHOO-ee on yer BOOT · phrase
Yelled at an opposition player lining up a shot at goal, hoping they miss.
Person 1"He's lining up from 40 out."
Person 2"Chewie on your boot, mate!"
"The whole crowd yelled chewie on your boot and he sprayed it."
Where it's from
The idea is that chewing gum stuck to the boot will send the kick off line.

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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.
To support a team.
Come on. Shouted from the stands to get your team going.
A spectacular high mark taken by jumping onto another player's back.