Toenailing or skew-nailing is to drive a nail at a slant or skew (between 20 to 30 degrees) with the initial surface in order to permit it to penetrate into a second member. It is a popular technique that carpenters use on a regular basis. The fasteners, used in pairs, nails or screws, are driven in on opposing angles. This locks the timbers toget... Found on http://en.wikipedia.org/wiki/Toenailing