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Definition of Cha-ching
1. Interjection. (US Canada Australia) Score!; Wow!; said to celebrate something that has made or will make lots of money. ¹
2. Noun. Money, cash. ¹
3. Verb. To make a cash register or slot machine noise. ¹
4. Verb. To make the noise of coins falling. ¹
¹ Source: wiktionary.com