This is used in frustration, anger, or amazement. Similar words "bloody hell", "oh dear", "mercy me".
Frustration - Kelly shouted "murder kapooh" having not completed the assignment and was immediately sent to the Principal office for her outburst.
Anger- "Murder kapooh" he said and slammed his fist into the wall.
Amazement - "Murder kapooh" shouted Amy, as she was announced the winner of the Annual Fine Arts Exhibition.
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