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1.
Term derived from the US Navy. When three sailors that work different shifts are required share a bed, each getting its use for an eight hour shift. Thus the bed (bunk) is always in use, always warm. i.e. hot bunk.

Term also describes the situation when a man-whore is bedding multiple women at times that nearly overlap. Thus the bed is in constant use and always warm. i.e hot bunk.
"Dick has always taken pride at hot bunking women. Too bad none of them weighed less than 400 pounds."
by WhyMe? January 10, 2014