The strip of snow left on the roof of ones car after driving without brushing the snow off the roof first. This usually creates problems for the drivers behind them.
When you are trying to clean your car off during or after a snowstorm but you and your ice scraper can't reach the top middle of the truck it creates a Mohawk-like design of snow on the vehicle.
Hey man, toughtime reaching the top of your truck? Ya got a snowhawk there.
A strip of snow left down the center of the roof of a person's vehicle. Either because they are too short to reach it, or just too damn lazy. Resembles the Mo~hawk hairstyle.
There was so much snow on his car that George gave up clearing it off and he left a big old snow hawk.