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.