The name for snow hanging off the undersides of cars is SNOWBEARDS, of course! (beards of snow)
They are called CHUNKERS. Back in the '70s WCCO radio’s Steve Cannon had a “chunk kicker’s club”. I still like to kick chunkers to this day; it’s oddly satisfying. Just be careful to pick a day closer to freezing or you can seriously hurt your kicking foot. Personally, I carry a stick in my car to knock the chunkers off before I park my car in the garage. Tidy move.
I also take my car through the car wash closest to my mechanic before taking my car in for winter service. And counsel others to do the same. Common courtesty! I think part of this comes for being married to “the mechanic” for 20 years and hearing how miserable it was to work under a dripping car.
My wife calls them Ice Boogers.
This somehow seems to be related: http://www.craigslist.org/about/best/den/1442777790.html
I’d call them “snowcicles”.