Noun. The act of tapping someone lightly on the nuts with your foot in an attempt to either piss them off, or let them know you mean business.
Lowry was getting ticked that Hank kept peeing on his house so he went out to yell at him one day to find that Hank would not listen so readily. Lowry then proceeded to give Hank "The Gordon Lightfoot", which knocked Hank out of his alcoholic trance. Then Hank having been "Gordon Lightfooted" decided to turn his life around and become a porn star.