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1.
An imitation of the sound made by a cash register, used when someone's action will result in mo' money; see also cha-ching
I'm gonna cash this check: ka-ching!
af dan 28. september 2004
 
2.
The sweet sound of cash. Usually associated with making (or spending) a windfall.

Etymology: from the sound an old-fashioned cash register makes when the cash drawer slides open.
I'm playing the ponies with my Social Security check. Kaching!
af tomte 19. maj 2004
 
3.
The sound a cash register makes. NY Times, 050904, in a review of Bob Woodward's book on the White House. "Plan of Attack".
"...to say nothing of the ka-ching of cash registers."
af John Heron 9. maj 2004
 
4.
The sound of a cash register that was revolutionized by Seth Green in his younger days.
Seth Green was the ka-ching guy.
af awesomemonster 9. december 2008