Hey Jim...you are correct - chuffed = pleased, stoked, thrilled etc. Do you guys over there say 'stoked' for when you're pleased as punch?!!
I'm not sure about an Aussie word, have heard it in southern Africa, not sure about the Southern Americas or Kiwis (New Zealanders)...could be a southern hemisphere thing I agree though, it is fun...imagine a global dictionary perhaps we'd better not!!!
Wouldn't mind learning some US words though