killin it: the act of being steezy and consistant hitting rails or jumps during a solid day of riding.
lack of killin it might mean that ya blowin it. no murduhh, just throwin down
Shredding powder all day throwing down tricks and stomping 3s and 7s off of huge as cliffs! then when you hed in for lunch hit some laps through the park and show up all of the noobs with you crazy style