It's possible that:
* The spelling is incorrect: Double-check the spelling and try again.
* It's a regional dialect: Wolof has regional variations, and the word might exist in a specific area.
* It's a loanword: It could be a word borrowed from another language.
To get a more accurate answer, please provide more context:
* Where did you hear this word?
* What was the situation?
* What do you think the word might mean?
With more information, I can help you find the meaning of "khamgako".