To make cocaine into lines, to excess consumption of cocaine.
Person 1 - 'Dude, why are you giving me so much grief? You have been up and down all night like a tit in a trance'
Person 2- 'Sorry blud, nothing personal, I've been chalked up all night'
Person 1 - 'What does chalking mean?'
Person 2 - 'Look it up on urban dictionary'
Person 1 - 'They wouldn't have the balls to put that up'
Person 2 - 'True'