Here's why I think that:
* "Kech" is not a recognized word in many languages. It might be a specific term in a niche context or a misspelling of a similar word.
* "Nega" is a relatively common word, but it usually has a different meaning depending on the language. In Italian, it means "negation," while in Japanese, it can mean "negative" or "dark."
To help me understand what you mean, please provide more context:
* What language is it from?
* Where did you hear it?
* What was the situation when you heard it?
Once I have more information, I can try to help you figure out what "kech nega" means.