Pioneered by Ken James (an engineering student at OSU), it is the ability to solve math and engineering problems without actually knowing how to do the problem. The technique involves ranking and ordering of numbers, canceling units, and other ninja like skills that enable you to at least approximate the correct answer, if not actually solve the problem.
Student: Damn! I can't do this.
Ken: It's answer "B"
Student: How do you know?
Ken: It's my mad ninja math skills. I can't explain how to do it because there is no real method, but if you know what to look for the answer just stands out.