If you've ever heard a gun load, you'll know what noise it makes. The noise is "ching-chang" and can be used any time you feel necessary. Usually, it is used to highlight one's awesomeness, or true style and pimpin'. See zing.
A: "Man, my girl gotta move her blog 'cause her friend is jealous of us!"
B: "You're such a vato right now, yo."
A: "Ching chang."