Mongrel
Aggression and a willingness to do it tough, in a player or a team. Also an insult for a nasty person.
Person 1"Why did we lose?"
Person 2"No mongrel. Got pushed off the ball all day."
"The coach wants more mongrel up forward."
Where it's from
A mongrel is a dog of mixed breed. It was an insult for people long before it became praise in sport.

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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.