Put the mozz on
To jinx something by mentioning it.
Person 1"We haven't lost a game all year."
Person 2"Don't put the mozz on it."
"Every time I say he never misses, I put the mozz on him."
Where it's from
From mozzle, meaning luck, borrowed from the Yiddish mazel.

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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.
Yelled at an opposition player lining up a shot at goal, hoping they miss.