Working in Patch 3.1.3
Alright lets get to it.
Requirements: Hearthstone on CD (Cool Down for the Noobs) and Time
1. You will need to start by going outside of Orgrimmar
2. Go to the location directed by the arrow below
3. Aim your character at about 110-115 degrees to the wall then walk forward. You should get stuck. (If you bump up to a higher elevation, restart.)
4. Aim your character's head slightly left of the wooden wall and use the auto-unstuck tool.
5. If all is well, you will jump underneath the ground infront of the gate like so.
6. Now have duels with your friends under Orgrimmar!
Make sure you are either an Elemental Shaman, Fire Mage, or Boomkin if you know what i mean >.<
-Kronus