http://www.chachachaencino.com/the-chachacha/
How has the original cha?
Well, the Cha Cha Cha is a relatively new dance which originated in the 1950s, where it became very popular. As far as I know it's in the same way as it was "originally." The Cha Cha is said to originate in the slow Mambo, which had a distinctive I was just called the "Triple Mambo", over time this was accelerated and became the hallmark of "slow, slow, quick quick quick "cha cha cha rhythm.
Singer Mario Dancing The Cha Cha Cha