You can throw chic chacs from the right side or left side.
A chic chac hits the floor then wall then floor. If you throw
it sidearm or higher you can get the right spin on the ball to
throw a chic chac from the left.
A chula is 99.99% going to be thrown from a reverse (left side).
When players throw a reverse to the back they are aiming to hit low on the back wall before hitting the floor, a chula.
When players throw a forehand, or raised left side to the back they are aiming to hit the floor near the back wall first, then the back wall, a chic chac.
Tony is wrong in his explaination. He says of course he knows but I am 100% sure this is correct.