It's possible you're thinking of a similar sounding word in Luhya. To help me understand what you're looking for, could you provide more context?
For example:
* What was the sentence you heard "amabaya" used in?
* What was the topic of conversation?
* What is the specific Luhya dialect you are interested in?
With more information, I can better understand what you're looking for and give you a more accurate answer.