What does "엇 noun" mean?

Hi there!

Someone wrote seeminly casual, so I can't fully set my question in context, but if I have something like

"엇 noun (name noun)", what does the 엇 mean in this context? I guess it could be either bad (like what I found about it in the Dong A dictionary), but could it also maybe be the short form of "엇비슷하다" ??

At least it would make sense in the context of the sentence which I don't want to disclose here.

But even if not, I find it astonishing that this prefix-particle, which is obviously used in Korean, isn't explained in any of my (several) Korean language/grammar books! :(

I even asked two Korean friends (without giving the full sentence) and even they couldn't come up with a proper explanation. I'm a bit disappointed. ;)

Thanks in advance.