A lass is Australian slangfor a girl who hangs out with lads. lads are 'gangsta', the most popular people at boys schools. often seen drinking, smoking and vandalising. Lass's are bassicly lad's sluts, they wear to much makeup and have bleached trashy hair.
a girl version of a lad. wears RL, nautica, tommy, Das, Nike, Lacoste ect. usually unwashed ratty ugly sluts but some lasses can pull it off and look bangin.