Do you guys realize that you should explain how you pronounce those words in the international phonetic alphabet?

If you can't agree on how to pronounce asciinema there is little chance you would pronounce "ass" "nuh" "neh" and "muh" the same way.

Well, what should be clear is that “nuh” implies the same vowel as “muh”, which I don’t think is the case for how “cinema” is normally pronounced. And I presume that it’s clear that “neh” is not pronounced the same as “nuh”. My point was not to indicate a precise pronunciation, just that I don’t see how “nuh-muh” would be right.

In addition, I personally can’t write IPA and be sure it’s correct, and I would expect that most people also can’t read it.

As a native Californian speaker of English it is indeed SIH-nuh-muh for me. The majority of unstressed vowels become a schwa "uh".

I agree that it should be neh-muh, but I can also see how nuh-muh is very similar.

That's not how I pronounce it, it's been sih-nuh-muh for me.