Definition of ka-ching exclamation from the Oxford Advanced American Dictionary

 

ka-ching

 exclamation
exclamation
NAmE//kə ˈtʃɪŋ//
 
(also cha-ching)(informal)
 
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used to say that someone is getting a lot of money The money was rolling in, ka-ching, ka-ching! Ka-ching! I just got my first check. Ka-ching! My blog is worth $70,000! A way of representing the noise made by a cash register.
See the Oxford Advanced Learner's Dictionary entry: ka-ching