Top Definition
The act of taking a shit on the side of the highway when there is no bathroom availible.
Gary had a serious case of turtle head poking while traveling down I-696 near Detroit. With no shitters in sight, he pulled over and took a Highway Dump in front of his car. He used his pants and underwear to wipe his ass, and was on his way.
by Floss 69 January 20, 2006

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