A sex term. When someone is on their knees giving you head, but doesn't want you to cum in their mouth or on their face. So instead you say that you'll finish yourself off onto their chest.
But instead of aiming directly at the chest, you aim your dick at a higher angle. When you cum, some of it will travel at an arc that will allow it to gently vault from your pole and upon their face. After the first initial 'burst', you aim directly at their chest so most of your cum lands there.
As most of it hit the target they thought it would hit, you can plead compete innocence and say it was an accidental occurrence.
Dude, last night I fully whipped out The Pole Vault on this chick!