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The sexual act of inserting a nailgun into the anus of your partner and firing it repeatedly, usually resulting in death or serious injury.
Guy #1: Dude I totally was Nailgunning my girlfriend last night.
Guy#2: How was it?
Guy #1:It was awful. I had to drive her to the hospital afterwards...she didn't make it.
by rustynail$$$ April 13, 2011
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