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A unit of measurement originally based on sections of the hand, is now most commonly associated with the penis and/or the surrounding area. It is equivalent to 6 inches, 1.5 hands, or two palms.
Guy 1: Hey, do you see that guy over there?

Guy 2: Yeah, what about him?

Guy 1: Lot's of chicks have said that he's got a two shaftments long package.
by Sgt Sarcasm March 26, 2012