A fork of Rural Dictionary
An Australian term to describe the radical change in a person's behavior when they start playing sports, aka stepping over the 'white line'. The radical change can result in a normally mild mannered individual, becoming aggressive, loud and extremely competitive maybe even violent during gameplay, once the game is over they go back to their usual mild mannered self.
"Bruce isn't one to start a fight, but once the whistle's blown he gets white line fever and who knows what'll happen."