Using slang in a Scientific Paper

Mathematicians frequently come up with questionable names drawn from a variety of questionable sources. And then at some point there will be the inevitable MathOverflow thread about why such-and-such is named what it is. I personally rather like "meromero," but in the context you're describing, I don't see how it's an improvement over saying "unique 'good' solution," where you define what exactly you mean by "good."

Your goal in writing scientific papers is for the language to be as intelligible as possible. That is, you want to use language which won't hinder people who are trying to read your paper.

The disadvantage of slang is that it is often not intelligible to many people (especially non-native speakers), and may be idiosyncratic to specific groups. Therefore, if your goal is for the paper to be as intelligible as possible, you would want to avoid using slang.

In addition, scientific writing tends to be relatively formal, which is why slang will often look inappropriate and out of place.

Some papers which mention that you should avoid using slang:

http://www.sciencedirect.com/science/article/pii/S1443950600900817

http://onlinelibrary.wiley.com/doi/10.1002/micr.20960/full

It's possible that conventions will be different in your field. When in doubt, look at other publications and use them to guide you.

Honestly, I don't think I'd do it in a scientific paper. There are lots of "internal" name for things in my own lab that I'd never put in a scientific paper. This is especially true if there's not an obvious meaning for it - which is usually true for slang.

The one place people do seem to get away with it is clever acronyms.

I don't know that I'd call it "bad taste", given said slang term isn't offensive. I'd just call it "weird word choice".