1) can be used as a substitute for "
little bitch";
2) expression of excitement;
3) when referred to a person you love/like
despite some odds.
1) He did not use blinkers! What a gunny!
2)
Oh, gunny! I cannot believe Ben asked me out!
3) I have been
waiting for hours for you to show up. You are a gunny, Abigail, but I still love you!