Katchow is a verb used in reference to flashing ur shiny headlights after beating someone in any car-related competition, including NASCAR Races and high-speed chases.
I/You Kachow
They Kachow
We Kachow
She/He Kachows
We Will Kachow
I Kachowed
I'm totally going to kachow on this lad after I beat him in this race.
