I've learnt many different things about this word, and I'm very confused by it. My Swahili course book (for Tanzanian Swahili) claims it means Miss (not Mrs), and that you can use it for example to young ladies at the market. Here it says grandmother, which I haven't seen anywhere else. In western Kenya, they stopped me from using it and said it's more something that you say to your wife. I'm very confused indeed.