The cue to get him to stop unwanted behaviour is to not react at all. That or replace the unwanted word with something else.
My B&G's word for "my human" was "Daddy". Since I am female, that seemed stupid to me. When he would call "Daddy" at me, I would respond with "Mommy". After a short while, he would say both and now he only says "Mommy"
On the other hand my B&G would scream his head off for hours a day, when I got him. After ignoring him for about a week he stopped the screaming