When help around the house changes, the way I'm addressed also changes. Amma, madam, akka, mam. And now...UNDI! Pronounced exactly how its spelt! I have heard it used many a time before but just not at me. Undi is sort of like giving respect while addressing the person except that all it does is crack me up! Here's an example, one a true incident and the other, just silliness.
Babu nidram poyinda? (Has the baby slept?)
Ownu undi. (Yes, undi!)
Babu undies ekadaa? (Where are the baby's undies?)
Undies aa undi? (Baby's undies, undi?)
Just typing that up made me smile :).