Cheats for Zombies?

Hey, guys alot of people have been asking? "Is there cheats for zombies?"
might i add that there is cheats for zombies just there like codes not ones in GTA but like a world or phrase.
I was woundering if anyone would happen to have these cheats.

If you do please post them and i will edit this post and add them to here so keep checking in and adventually someone will post some cheats.

_-*CHEATS*-_

PC-

Ps3-

Xbox360-

Wii-