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1.
To perform sexual intercourse with a dead horse.

This was practice was common among cowboys and indians alike but is thought to have originated on the Stepps of Northern Asia by the Mongolians who's affection for horses is legendary.
I banged that dead horse like a cheap screen door and she would have loved it if she were not dead as a doornail.
by Haywood Jablowme July 16, 2004