It's possible that you are thinking of:
* "Cahaba": This is the name of a river in Alabama, USA. It is also a place name, referring to the town of Cahaba, Alabama.
* "Cacao": This is the raw bean of the cacao tree, from which chocolate is made. It's possible you heard "cahoba" as a misspelling or variation of "cacao."
If you provide more context about where you encountered the word, I might be able to provide a more accurate answer.