A person who thinks they're sick at skiing. They ski with their poles poking out to the side while leaning back and it looks like they are trying to block something from hitting their parts. They fail at their attempts to be steezy and look like posers.
W- "There's so many people these days who don't know how to ski, they're just in the sport to be cool"
A- "Yeah they have to center mount all their skis so they can be blockrs and not fall on their backs"
W- "Haha did you see that blockr last run? he looked like he was holding an invisible shield over his crotch"