Some years ago, the front page of Golf Digest promoted an instructional article called something like "Extend Your Flatspot". McLean described this procedure in such a way to promote the idea that the clubhead strikes the back of the ball while moving horizontally towards the target. I'll bet he uses the word in the show.
Good thing young David didn't have a Flat Spot in his Slinging Action when he went mano-on-mano with Goliath.
Then again, Goliath might have a different opinion...