A term used by soccer players that pertains to the moment when a player goes to be a show off, thinking they are going to take an amazing kick but turns out shanking the ball. Shanking is kicking the ball way over the goal or way out of the field in general. hence.. A terrible shot.
example 1. That was quite a shankapotamus of a kick, it went way past the goal!
example 2. HOLY SHANKAPOTAMUS!! (as the ball goes flying a mile over the goal.)