This term is reserved for supervisors who you as a subordinate brief your way out of a jam on an excel spreadsheet. This can be most conviently described as when you are giving a briefing of some sort, like on an excel spreadsheet. And when you explain or brief your way out of a problem. The supervisor or boss will just add an extra column and you then fucked again.
What the fuck man? I thought you had briefed your way out of that jam. Yeah me too until that asshat pulled out the add an extra column to the spreadsheet. Yeah I know he did pull out the ball bag musket on you.
Usually to kick a goal, or to achieve a few extra points, during a game of sport such as rugby or gridiron.
Rugby: He missed the conversion failing to add the extras.
Gridiron: After the touchdown he managed to add the extras with a great kick.