A snowtard is a driver who, when introduced to a snowy/icy environment will act entirely inappropriately.
There are many ways in which you can express your self as a snowtard, some are more dangerous than others.
The most common and harmless snowtard is one who simply avoids leaving his or her house at the sight of snow, he or she is most likely to become a problem when calling you and either flaking out on previous plans or asking you for help in the form of transportation.
Another type of snowtard is considerably more visible, this is the moron you'll see spinning his or her tires for the sole purpose of destroying them. This type rarely goes very far and will often abandon their vehicle in the middle of the most heavily used arterial road because of a flat tire which he or she probably can't even change.
The final type of snowtard that I will be explaining today is the maverick type; this moron has a fairly decent vehicle equipped with AWD, traction control, snow tires, etc. and has come to the conclusion that they are completely invincible to snow. You will notice this person getting as close as possible to your rear bumper honking and beaming their 10,000 watt xenon lights into your car like a fucking UFO, when they finally get over the superiority of showing you how slow they think you are they will pass you and proceeded to go twice the speed limit. You will later find their car upside-down in a nearby ditch as the maverick snowtard doesn't understand the new difficulty created by the snow.