What happen if i hear a loud pop in my wrist and it pops when i move up and down?

It depends: If there is no pain, ignore it. If there is pain then have the wrist evaluated.

Many: wrists make popping the noise and the key is wheter that pop really is associated witht he pain and then if there is a tendon or ligmanent injury, Rest ice and compression will help acutley but sounds like you ll need to see a hand surgoen in the near future