Gunny

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!