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What WAS the true nature of the schmutz ornamenting my bedroom window?

Bird excrement? Unlikely. It originated on a cold night in a vicious thunderstorm. What kind of a birdbrain would go out in that kind of weather? If someone tells you: "The dyspepsic bird flies at night." They are probably testing to see if you give the countersign. You know, because you are their spy versus spy contact. I suggest turning tail and skipping away unless you are willing to accept the plans to the doomsday device and ferry them to the next cell in the chain.

In addition to the rain and the lightning, I could hear the upstairs neighbors shuffling around, while they are usually comatose.

Now, turning to the actual substance which was yellow-brown, waxy, hard to scrape off, and smelled disgusting-

A day sunny enough to take the screen off and clean the outside of the window is what brought on my encounter with unpleasant organic matter-

Vinegar and detergent and a nylon sponge, and a plastic straight-edge were employed to ultimately successfully remove-

What looks to be upstairs condo vomit.