Shituation - pronounced like "situation": def. the sudden realization of an impending intestinal commotion of some sort, but most commonly used when referring to the need to get to the nearest bathroom facilities that will hopefully provide the privacy and comfort needed in order to assure a smooth delivery of the offending intestinal ordnance.
Todd: Hey man, take the next exit...I feel a serious shituation coming on!
The circumstance that arises when a baby's poop is so explosive that it transcends the bonds of the diaper. May be exacerbated by the flailing tyke's tendency to "spread the news" with involuntary arm and leg motion. Usually demands the attention of multiple adults.
Some shituations can only be properly addressed with a garden hose.