deader

A person who claims they skate and brings it up whenever it fits in the conversation but hasn't skated for a long period of time, usually years.
AND/OR
They own a skateboard but rarely use it or don't put effort into riding/learning tricks, yet tell others that they're a skater.

skater girl: dude i'm so tired of serena bragging about skateboarding, its like own of her personality traits but every time we invite her she has an excuse

skater boy: seriously i've never even seen her do an ollie, i bet she's a deader.