To clear up some confusion (and correct me if I'm wrong Shleed), the term 'bint' is slang for just any type of female. It's more commonly used in Ireland and the UK. Can be taken as a term of endearment, I guess.
I think gus adopted the term because Shleed referred to her as one, and she decided to play down it's effectiveness.
As I said, correct me if I'm wrong.