Wiktionary
cha-ching
alt. (context US Canada Australia English) score!; wow!; said to celebrate something that has made or will make lots of money. interj. (context US Canada Australia English) score!; wow!; said to celebrate something that has made or will make lots of money. n. money, cash. vb. 1 To make a cash register or slot machine noise. 2 To make the noise of coins falling.
Wikipedia
Cha-Ching
"Cha-Ching" is a song by Canadian pop rock group Hedley. It was released in August 2009 as the lead single from the band's third studio album. The song entered the Canadian Hot 100 at #34 on the 36th week of 2009 and ended up reaching the top ten peaking at #6. It is about reality television shows being fabricated, and references several TV shows and stars.