I think what you want is just called "Shear".
http://www.f-lohmueller.de/pov_tut/trans/trans_450e.htm
Most times when people refer to "skew" it's more of a corkscrew type of
deformation - typically encountered 50 times when trying to get a single
straight 2x4 out of a pallet of lumber at a Big Box store. :|
