Reading how someone figured out how to get unlimited ammo and all weapons, thought I'd try to do something, AND THIS WORKS!!
INVINCIBILITY! Wanna play God-Mode in single-person SP games? Follow the same procedure with the "SWEET" cheat (ESC, click OPTIONS, move mouse to lower-left corner, click once) then type BEEFCAKE (I noticed my harddrive being accessed as I typed this cheat - guess that's your clue that the cheat worked.)
Now those turkeys won't do anything more than pluck at your 100-health fat ass (assuming you're playing as Cartman, and of course you ARE, right?) Now you can get through this lame game without having to buy a few cases of Jolt! Still kicks ass in MP though - you may find me as BabaBooey.