Coined during the korean war and became widely popular during the vietnam war. Referring to the way the head of an asian enemy tended to split open when shot in the middle of the forehead. This splitting is due to the frontal skull suture found in mongoloid bone structure. massive directed trauma to the forehead will often cause the skull to split along the suture line causing the head to appear as if opened by a zipper.
The zipperheads were overrunning our position.
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