-Run game
              -Enable console from options menu
              -Press ~ to bring up console
              -Type "seta thereisacow 1337" and then "spdevmap <mapname>" or go to
               the map you want from the menu, but it will not work if you resume game
              -For mapname, put the name of the map you want to load with cheats
              -Type the following options you want in the console:

               noclip - lets you fly and go through walls
               ufo - same as noclip?
               give <item> - gives you an item. put all for all weapons
               god - invincibility
               demigod - god mode but your screen still shakes
               notarget - enemies can't see you
               give ammo - refill ammo
               jump_height <ammount> - change gravity
               timescale <ammount> - slow motion or chipmunk mode
               cg_LaserForceOn - laser sight on any gun
               r_fullbright - way easier to see stuff this way :)
               cg_drawGun - Get rid of your gun
               cg_fov - lets you zoom with any gun

               some of these are not real cheats but they still give you
               a big advantage in the game

              http://callofduty.com/