Asking for a treat when you find someone happy/promoted/expressing ecstasy.
milega? is a hindi word which means "can i"
Treat milega? :P : can i get/have a treat?
:P - you are not sure if the other person would be willing to treat you.
you seem to be very happy. treat milega? :P
wow! you have been promoted. treat milega? :P
Not bad,you got engaged. treat milega? :P