Poopsicle, according to the science I've been told! You don't hear that word too often. Solution? Stop flying so bleedin much and stop building new runways.
Giving new meaning to the phrase "no ****, Sherlock!" FWIW, aircraft don't dump feces in flight. It's illegal for one thing. Sewage is pumped out on the ground. That said, occasionally valves stick and waste leaks out. In high altitude flight, it will leak out and freeze to the side of the aircraft. After descending to a lower altitude, the "blue ice" sewage melts and breaks free. https://www.quora.com/Has-anyone-ac...rine-from-a-plane-dropped-from-a-great-height
That's why I referred to Poopsicles (which is a reference to a leak that generates an accidental 'dump')