Poser slang, that they use to describe anything to do with skateboarding. This is a really stupid term and should never be used, but it has its highlights..........if someone uses it you can tell that they suck at skateboarding before you even see them skate.
Poser#1: Hey man, lets go sk8
Poser#2: Right on, i just waxed my Griptape for darkslides.
Poser#1: I can do those, but only when nobody is watching me.
Poser#2: Me too, Sk8 or Die.