How to Change "Slide To Unlock" Text Without Winterboard
First off, in order to do this you need to have a jailbroken device, with a program that allows you to ssh, or access your files. If you do not know how to do this, please read SSH Alternative before continuing. SSH is somewhat complex, and is not recommended unless you know what you are doing.
Now that that's settled, open either iFunBox, or WinSCP.
Navigate to System/Library/CoreServices/SpringBoard.app/English.lproj/
Copy Springboard.strings to your desktop
*Make sure to make a backup incase you want to revert*
Rename it to Springboard.plist.
Open Springboard.plist in Notepad and Search AWAY_LOCK_LABEL
*You can search in notepad using CTRL + F*
Edit next to the line AWAY_LOCK_LABEL, it should say "slide to unlock".
Change "slide to unlock" To whatever you would like.
Name the file back to Springboard.strings, and put it back where you got it..
Reboot or Respring your iPod Touch or iPhone, and you should see the new text!