If you are in a red car and you pass another car, you are obligated to flash your headlights and yell "Kachow!" Or when you get into a car accident.

Yes my dude

when you're too cool

Lightning McQueen's catchphrase in Pixar's latest animated film, Cars.

a word used by the sexiest living creatures on the earth

When you're about bust a nut in her mouth and whisper in her ear "kachow."

Also commonly referred to the classic catchphrase of the notorious "Lightning McQueen", kachow is a term that is used as a reference to when a man sneezes while taking a piss resulting in a "KACHOW". A kachow can only be avoided if the victim starts to force his piss stream to a higher PSI, or just holding in the sneeze.

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