The word Kachow is a medical and meme-ical term used to describe an intense emotional feeling of sadness and/or internal pain and distress.
The word and term can be used in colloquial sentences, in diagnosis or as an expression of one's current mood.
An example of the term in use can be shown as such:
Friend1-"Hey bro, how are you feeling today.. you look pretty depressed?"
When getting a blow job you give the girl a money shot trying to get most on the cheek and some in the eye. Then you shine a flashlight in her face and make it shine like Lighting McQueen. If done right she should also look like shee is winking