When a well-endowed man stands with his hands on his hips and shakes them forward and back, his penis provides an example of a pendellum. His "head" will swing back and hit the top of his butt crack and swing forward and hit him in his abdominal muscles. Probably named after a man named Fiegle and the term is commonly used on the East US coast.
He got so drunk he entertained the crowd with the Fiegle Shuffle.
by Noisewater May 02, 2006