True Skateboarder: One who rides a skateboard for the fun of doing it. Usually they are the kids that go to skateparks and stay for hours without giving up because they want to learn a new trick.
Poser Skateboarder: One who thinks that owning a skateboard instantly makes him cool. Usually they are the ones that carry their skateboard everywhere, including school. Most of the time they wear really tight clothes and grow their hair out.
True Skateboarder: "Hey man did you see that triple kickflip?"
Poser Skateboarder: "Nah man I was flippin' my hair"
True Skateboarder: "You should try that"
Poser Skateboarder: "Nah man I might rip these new tight jeans"