The piling on of more and more shit i.e. in a work environment. This came to me while I was thinking about the ongoing difficulties one of our senior managers was causing. We were working on a project for her and every time we were close to completion, she would change her mind or make more and more outrageous requests. The word is a combination of incremental and excrement. So the next time you are in a situation of any kind where the shit keeps mounting, you my friend, are in an excremental situation.
The project will not be completed due to the excremental shenanigans of our boss.