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To elaborate: This derives from sailing. If I had to guess, I would say that two of the sheets (or lines) in question are the port and starboard jib sheets (the jib is a smaller sail that is positioned over the bow). The third would then belong to the mainsail. This accounts for all of the crucial lines in your typical small to mid-sized craft. The point being that, if all three are flapping loose in the breeze, or "to the wind", then you have about as much control as a well-embalmed bar patron.