dirty Navy
n.— «I have heard rumors that on some ships, the ships store no longer carries tobacco, even though smoking is allowed in the designated area.…Fortunately this is my last tour, and I am spending it as a part of the Dirt Navy, so I will not have to deal with that problem in the future.» —“Re: US Navy and smoking” by Charles L. Decker Jr. Usenet: alt.smokers.pipes Nov. 18, 1999. (source: Double-Tongued Dictionary)
Further reading
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