When you're banging a girl from behind, she's holding onto the headboard, and you knock her arms out from under her, her head plows into the headboard, just like a snowplow hits the road.
the REAL definition is this: a man is giving it to a girl from behind. he then pulls her up by the legs and knocks her arms out from under her. He then proceeds to drive her across the carpet on her face like a snow plow.
I gave Cindy the snowplow last night, and her tits are STILL red!
When a couple is performing sex in the doggy style possition, the man yells "Snow Plow!" Then proceeds to reach forward and pull the womans arms out form under her. The woman then falls face first, resulting in the snow plow appearance.
Kati from work needed a good pounding so I gave her the snowplow, to keep it interesting.
During intercourse; Most often occurs in the 'doggy' position. When the giver lifts the givee's up in a wheelbarrow-like position and walks forward fast enough for the givee to lose stability and fall on his/her/its face. The giver then proceeds to push forward, scraping the givee's face on the floor. Usually results in injury.
You should have seen the carpet burn I gave her last night when I gave her the snowplow.