/muy/ , pron.
1. (a form of the possessive case of I used as an attributive adjective): My soup is cold.
interj.
2. Also, my-my . (used as an exclamation of mild surprise or dismay): My, what a big house this is! My-my, how old he looks!
[ 1125-75; ME mi, var. of min, OE min; see MINE 1 ]
Usage . See me .