n. someone who takes too much space on a road or highway; someone who seems to run other people off the road. : Get over! Road hog!
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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A motorist whose vehicle straddles two traffic lanes, as in Stay in your own lane, you road hog! This expression uses hog in the sense of "a greedy or selfish person." [Colloquial; late 1800s]
