What do people when they say ja ja (or Jha Jha) in Reggae?

Question

What do people when they say ja ja (or Jha Jha) in Reggae?

Answer 1

The Rastafari movement (also known as Rastafari, or simply Rasta) is a new religious movement that accepts Haile Selassie I, the former Emperor of Ethiopia, as God incarnate, called Jah or Jah Rastafari.  They are most likely refering to Haile Selassie.  

In Rastafarian teachings, Africa is associated with Zion, and Africa/Zion is the starting place of all human ancestry as well as the original state of mind that can be reached through meditation and the ganja herb.  They also could be talking about ganJA.

Answer 2

Jah Rastafari!

They are referring to God.

Answer 3

Yea, it means God or Lord