* It's a misspelling: It could be a variation of another word, like "Mukasa," which is a common surname in Uganda.
* It's a regional term: It might be a word specific to a particular dialect or region. If you could provide more context, such as where you heard it or what the subject matter was, it might be easier to figure out its meaning.
* It's a made-up word: It could be a fictional name or term used in a specific context, like a book or movie.
Without more information, it's impossible to determine the exact meaning of "mukansa."