It is a way of conveying the futility of one's apology after making a mistake. Usually used by primary school kids who are yet to master the coveted butler english.
Lil murthy - Hey chotu, I broke your pencil and also ate your tiffin! saary okay!
Lil Gowda almost about to burst out crying - hoon, sorry, sorry one plate poori! I WANT MY IDLY BACK ! Ammaaaa....
Added 2012-04-21 by VJ