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Large chunks of Ice and/or slush that get stuck behind a vehicle's tire.
Jesus Christ, Thoms, get rid of the Fenderburg
by N. Dave February 18, 2004
The collection of ice and snow that is found hanging in the wheel well of a vehicle after driving on snow covered roads and highways.
The fenderburgs on my car are so big they are rubbing on the tires.

Simi truck operaters drive on the "warning bumps" grooved into the shoulder of the highway to vibrate off their fenderburgs.
by Ace LeRoy May 27, 2009