A snack bar or canteen, especially one on a military base or ship, serving candy, drinks, and light refreshments.
From military slang, possibly onomatopoetic from the sound of vending machines, or from the Dutch 'gedoken' (to squat/crouch). Widely used in U.S. Navy and military contexts from the early 20th century onward.
Military slang creates incredibly vivid words—'gedunk' captures the whole sensory experience of grabbing a quick snack in a cramped ship or barracks, and it's been keeping sailors happy for over a century.
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