In soccer this is AKA as a bicycle kick. It is when a player throws himself or herself in the air with his or her back parrallel to the ground in aim to volley a high ball (with the foot obviously). The term chilena is used mainly amongst the hispanic community and is derived from the fact that a chilean soccer player first executed this.
Man, did you see that awesome chilena Hugo Sanchez scored with when he played for Real Madrid!?