What is the term for a tennis shot when the player hits the ball between their legs while facing the back fence?

"Another interesting shot named "tweener" was first performed by Yannick Noah that [has the] player facing away from the net hit the ball between his legs." -from https://en.wikipedia.org/wiki/Tennis_shots

The reference above also refers to a Great Willy or Sabatweeni. This picture of a Great Willy makes it look as if he has just completed a shot through the legs with his back to the net, although the English article's description of the shot doesn't make that clear. My Spanish isn'y up to checking the content of this page.

http://es.wikipedia.org/wiki/Gran_Willy

Some commentators call the shot "showing off".