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Invented by a military man named Terry Miles in 2008. Used to describe a closet homo sexual. That likes to look at other peoples penis, from a distance in the locker room. As not to be caught in the act. Much like a Sniper does.
"I caught Joe looking at my junk out of the corner of my eye again. He's such a Pipe Sniper"
by SPC Miles February 04, 2010