blue canoe
n.— «Tired of squatting over slit trenches, Chief Warrant Officer 3 Kevin Powell scavenged for wood and built a first-class “blue canoe,” complete with a padded toilet seat and magazine rack.» —“Troops in Iraq find comfort in keeping mind occupied, body strong” by Jon R. Anderson Stars & Stripes Oct. 21, 2003. (source: Double-Tongued Dictionary)
Further reading
David from Plymouth, Wisconsin, wonders about the expression a cord of wood. The phrase goes back to the 17th century and has to do with using a cord to measure a specific quantity of stacked wood. This is part of a complete episode.
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