Originating (presumably) on the World of Warcraft forums, this is an essentially derogatory concept some people employ that means that all that a certain class
must do in order to achieve success in the game is to bind every
key on their keyboard to
one ability that is perceived to be overpowered, and then continue to roll their face across the keyboard. The notion is that this
one ability is so amazingly overpowered in relation to those of other classes, all
one has to do is absently spam it as much as possible (and they might as
well do it with their face, because there isn't any other use for the big stupid thing on top of their shoulders).