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The itchy burning skin malady one gets from sitting on a boat all day with wet butt, with cotton shorts being the worst. Often experienced by coxswains, but may also be experienced by anyone who spends a lot of time sitting in sailboats, skiboats, canoes, etc. Note that the proper pronunciation of "coxswain" is "cocks'in".
After a long day of water skiing, everyone had a bad case of coxswain ass.

Stop the boat for a minute, I need to stand up, that coxswain ass is driving me nuts!

During that canoe trip in Deliverance, I'm guessing that Ned Beatty wasn't the only one that had a case of the coxswain ass.
by grind s. September 08, 2010
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