Someone who is thought to be Jewish without actually being Jewish. Normally is a person with at least one friend who everyone knows is Jewish. Friends normally don't know how if they are really Jewish or not for at least six months. Possibly have a Jew fro.
Not necessarily a negative term. Tend to be pretty amazingly awesome people. Most likely pretty damn sexy.
Bob: Wait. You're not Jewish?
Jim: Uh, no.
Bob: Woah, you're like some crazy poser jew then
Jim: Yeah. I'm tottaly ready for Jewish end of the world or Christian end of the world.