Thread:OtisElevatorGuy1/@comment-9059509-20140328022827

Here's how.

Open Cydia and add this repo: cydia.bassamkassem.com

Open the repo.

Look for a tweak called Ac!d Siri for whatever iOS you have installed.

Install and respring.

Re-open Cydia and add this repo: http://wordjelly.com/repo

Look for a tweak called iOS 6 Wordjelly Control Panel.

Install and respring.

Go into Settings, then General, then Siri.

Turn Siri on. That's it!  