What is it called when someone says something inaccurate about something they know nothing about??
closed as too broad by RegDwigнt♦ Oct 20 '14 at 9:48
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We consider the speaker to be "out of their depth," and we consider the statement to be "uninformed." We call the speech act itself "uninformed" as well.
"Bloviating" is my favorite. It has a hint of the terms hot air and blowhard in it, both of which are also appropriate.
An ignoramus is a sort of proudly ignorant person -- that fits too.
When someone says something inaccurate about something they know nothing about :
Not sure this is exactly the flavor of expression you're looking for, but this is often called:
"Talking Out Of His Ass".
Edit: If you feel the need to downvote something, why not leave a comment saying why? That way you're actually contributing to the community and the question.
Edit 2: No really. "Talking out of his ass" is a valid phrase, that is used in a number of places, and everyone in those places knows exactly what it means, and it means exactly what the asker is asking.
It is a valid answer even if you don't like it. If you believe the answer is of low quality and feel the need to downvote, please do so. Ranking by quality is, after all, what makes this site useful.
However, downvoting without taking a moment to comment on why you think an answer is of low quality is basically the equivalent of a grade-school kid making farting noises out the window as the school bus drives by. Surely we can do better?