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The Collaborative International Dictionary of English v.0.48 (gcide)

Roorback \Roor"back\, Roorbach \Roor"bach\, n.
A defamatory forgery or falsehood published for purposes of
political intrigue. [U.S.]
[1913 Webster]

Note: The word originated in the election canvass of 1844,
when such a forgery was published, to the detriment of
James K. Polk, a candidate for President, purporting to
be an extract from the "Travels of Baron Roorbach."
[1913 Webster]