originally it was supposed to mean something being said or done unprompted. most people use it wrong so it doesn't make sense. here for example, the prompt is in the caption. someone died. that's the prompt. the use of was follows it logically.

the proper use of the meme would be something like:

Nobody:

Stephen King:

because he just says that shit unprompted, no one asks him about it, no one accuses or even suspects him being involved and suddenly, after years of criticizing orange mussolini, this happens to be the one time he supports him. that justifies the "nobody:" imo.