It's a combination of Bingo and Cha-Ching, which can be used to express the fact that someone got the right answer, hit the nail on the head, etc. It can be used when Bingo alone or Cha-Ching alone will not suffice.
For example, breaking a wallbanging record would count as a CHINGO!
CHINGO!!! We surpassed our last Wallbanging comment count!!!