It is very possible to agree upon a language with your interpreters and colleagues who are also Deaf. So you create something not official but what works for you and your situation.
This approach often works fine for me: try to convey the meaning into movement and dynamics. Signed Languages are very powerful and are conceptually more capable to express something at its core instead giving it a name. Add to this "core" sign a few modifiers like fingerspell the first or the first few letters, and what works very well in Swiss German Sign Language, mouthing, i. e. move the mouth as if you would verbalize but don't make a sound. These mouthings are linguistically known as "mouth pictures". Exactly as loan words, and often the loaned words are mangled horribly but they are just an expedient for communication.
As a result, it was expected that if we traveled a few hundred km in any direction, the local signs might be dramatically different than the ones we're used to, and so we'd better learn to interpret context and ask what specific words meant.
The word "Blub Paradox" in itself is a good example of what Deaf people do if they encounter concepts they need to communicate. They make up words. Signed Languages are very productive in making up words.
So it is not just an idiom, slang or jargon, it is more than that.
I imagine a similar set of signs arising in different disciplines.